Script to check if some program is already installed
How can I create a bash script that checks if a program is already installed, and if it isn't, installs it?
Thanks for your help.
Here's the code I have so far:
#/bin/bash
PS3="choose an option"
select opcion in "Installing_Youtube" "exit"
do
case $opcion in
"Installing_Youtube")
youtube-dl > /usr/bin
if [ $? -eq 127 ] ; then
echo "installing youtube"
apt-get update
apt-get install youtube-dl
mkdir Videos
else
echo "Youtube already installed"
fi
;;
"exit")
exit
apt bash scripts
|
show 3 more comments
How can I create a bash script that checks if a program is already installed, and if it isn't, installs it?
Thanks for your help.
Here's the code I have so far:
#/bin/bash
PS3="choose an option"
select opcion in "Installing_Youtube" "exit"
do
case $opcion in
"Installing_Youtube")
youtube-dl > /usr/bin
if [ $? -eq 127 ] ; then
echo "installing youtube"
apt-get update
apt-get install youtube-dl
mkdir Videos
else
echo "Youtube already installed"
fi
;;
"exit")
exit
apt bash scripts
9
Do you intend to overwrite/usr/bin
?
– D. Ben Knoble
Dec 23 '18 at 0:51
1
Are you differentiating between package names, and executable filenames? Or want to check both? Only George's answer currently checks for executables
– Xen2050
Dec 23 '18 at 3:27
Why do you want to check it? What's the purposed use of this script?
– Braiam
Dec 23 '18 at 11:11
@Braiam At least with apt, installing an already installed package will change its status from automatic to manual if it was only installed as a dependency of another package. If that other package is later removed, this package will no longer be marked for auto removal. I have a script to install an edited list of packages from a previous install into a new one. This technique keeps it from making a mess of the new system.
– Joe
Dec 27 '18 at 0:42
@Joe which is a bad solution. You should instead just get the list of installed packages withapt-mark showmanual
then installing with something likeapt-get install "$(< package.list)"
.
– Braiam
Dec 27 '18 at 13:02
|
show 3 more comments
How can I create a bash script that checks if a program is already installed, and if it isn't, installs it?
Thanks for your help.
Here's the code I have so far:
#/bin/bash
PS3="choose an option"
select opcion in "Installing_Youtube" "exit"
do
case $opcion in
"Installing_Youtube")
youtube-dl > /usr/bin
if [ $? -eq 127 ] ; then
echo "installing youtube"
apt-get update
apt-get install youtube-dl
mkdir Videos
else
echo "Youtube already installed"
fi
;;
"exit")
exit
apt bash scripts
How can I create a bash script that checks if a program is already installed, and if it isn't, installs it?
Thanks for your help.
Here's the code I have so far:
#/bin/bash
PS3="choose an option"
select opcion in "Installing_Youtube" "exit"
do
case $opcion in
"Installing_Youtube")
youtube-dl > /usr/bin
if [ $? -eq 127 ] ; then
echo "installing youtube"
apt-get update
apt-get install youtube-dl
mkdir Videos
else
echo "Youtube already installed"
fi
;;
"exit")
exit
apt bash scripts
apt bash scripts
edited Dec 22 '18 at 22:01
Elder Geek
26.5k952126
26.5k952126
asked Dec 22 '18 at 19:30
GUILLEM NAVALON BABIAGUILLEM NAVALON BABIA
487
487
9
Do you intend to overwrite/usr/bin
?
– D. Ben Knoble
Dec 23 '18 at 0:51
1
Are you differentiating between package names, and executable filenames? Or want to check both? Only George's answer currently checks for executables
– Xen2050
Dec 23 '18 at 3:27
Why do you want to check it? What's the purposed use of this script?
– Braiam
Dec 23 '18 at 11:11
@Braiam At least with apt, installing an already installed package will change its status from automatic to manual if it was only installed as a dependency of another package. If that other package is later removed, this package will no longer be marked for auto removal. I have a script to install an edited list of packages from a previous install into a new one. This technique keeps it from making a mess of the new system.
– Joe
Dec 27 '18 at 0:42
@Joe which is a bad solution. You should instead just get the list of installed packages withapt-mark showmanual
then installing with something likeapt-get install "$(< package.list)"
.
– Braiam
Dec 27 '18 at 13:02
|
show 3 more comments
9
Do you intend to overwrite/usr/bin
?
– D. Ben Knoble
Dec 23 '18 at 0:51
1
Are you differentiating between package names, and executable filenames? Or want to check both? Only George's answer currently checks for executables
– Xen2050
Dec 23 '18 at 3:27
Why do you want to check it? What's the purposed use of this script?
– Braiam
Dec 23 '18 at 11:11
@Braiam At least with apt, installing an already installed package will change its status from automatic to manual if it was only installed as a dependency of another package. If that other package is later removed, this package will no longer be marked for auto removal. I have a script to install an edited list of packages from a previous install into a new one. This technique keeps it from making a mess of the new system.
– Joe
Dec 27 '18 at 0:42
@Joe which is a bad solution. You should instead just get the list of installed packages withapt-mark showmanual
then installing with something likeapt-get install "$(< package.list)"
.
– Braiam
Dec 27 '18 at 13:02
9
9
Do you intend to overwrite
/usr/bin
?– D. Ben Knoble
Dec 23 '18 at 0:51
Do you intend to overwrite
/usr/bin
?– D. Ben Knoble
Dec 23 '18 at 0:51
1
1
Are you differentiating between package names, and executable filenames? Or want to check both? Only George's answer currently checks for executables
– Xen2050
Dec 23 '18 at 3:27
Are you differentiating between package names, and executable filenames? Or want to check both? Only George's answer currently checks for executables
– Xen2050
Dec 23 '18 at 3:27
Why do you want to check it? What's the purposed use of this script?
– Braiam
Dec 23 '18 at 11:11
Why do you want to check it? What's the purposed use of this script?
– Braiam
Dec 23 '18 at 11:11
@Braiam At least with apt, installing an already installed package will change its status from automatic to manual if it was only installed as a dependency of another package. If that other package is later removed, this package will no longer be marked for auto removal. I have a script to install an edited list of packages from a previous install into a new one. This technique keeps it from making a mess of the new system.
– Joe
Dec 27 '18 at 0:42
@Braiam At least with apt, installing an already installed package will change its status from automatic to manual if it was only installed as a dependency of another package. If that other package is later removed, this package will no longer be marked for auto removal. I have a script to install an edited list of packages from a previous install into a new one. This technique keeps it from making a mess of the new system.
– Joe
Dec 27 '18 at 0:42
@Joe which is a bad solution. You should instead just get the list of installed packages with
apt-mark showmanual
then installing with something like apt-get install "$(< package.list)"
.– Braiam
Dec 27 '18 at 13:02
@Joe which is a bad solution. You should instead just get the list of installed packages with
apt-mark showmanual
then installing with something like apt-get install "$(< package.list)"
.– Braiam
Dec 27 '18 at 13:02
|
show 3 more comments
5 Answers
5
active
oldest
votes
you can do this:
dpkg -s <packagename> &> /dev/null
then check exit status.only if the exit status of the above command was equal to 0
then the package installed.
so:
#!/bin/bash
echo "enter your package name"
read name
dpkg -s $name &> /dev/null
if [ $? -ne 0 ]
then
echo "not installed"
sudo apt-get update
sudo apt-get install $name
else
echo "installed"
fi
Really thank's! It works :D
– GUILLEM NAVALON BABIA
Dec 22 '18 at 21:13
Except it doesn't? What happened to the line withsudo apt install $name
? The command needs to go on the next line... Otherwise, nice work...
– Zanna
Dec 22 '18 at 21:30
3
Note that software could be installed in a variety of ways, anddpkg
is only relevant for installed debian packages. In OP's particular case,youtube-dl
for instance could be also installed via python's package managerpip
– Sergiy Kolodyazhnyy
Dec 22 '18 at 21:36
2
Why notif dpkg -s “$name” &> /dev/null ; then
? Same effect, cleaner/clearer imo.
– D. Ben Knoble
Dec 23 '18 at 0:52
indeed, checking the exit status is exactly whatif
does...
– Zanna
Dec 23 '18 at 10:35
|
show 1 more comment
Here's a function I wrote for the purpose that I use in my scripts. It checks to see if the required package is installed and if not, prompts the user to install it. It requires a package name as a parameter. If you don't know the name of the package a required program belongs to you can look it up. Information on that available here.
function getreq {
dpkg-query --show "$1"
if [ "$?" = "0" ];
then
echo "$1" found
else
echo "$1" not found. Please approve installation.
sudo apt-get install "$1"
if [ "$?" = "0" ];
then echo "$1" installed successfully.
fi
fi
}
add a comment |
This line of command will check using the which
program and will return 0
if installed and 1
if not:
which apache | grep -o apache > /dev/null && echo 0 || echo 1
Of course you will use it in this manner in your script:
which "$1" | grep -o "$1" > /dev/null && echo "Installed!" || echo "Not Installed!"
A simple usage would be:
#!/usr/bin/env bash
set -e
function checker() {
which "$1" | grep -o "$1" > /dev/null && return 0 || return 1
}
if checker "$1" == 0 ; then echo "Installed"; else echo "Not Installed!"; fi
Note several things:
- You will have to deal with dependenciy issues while installing
- To avoid interaaction with script during install see here for examples.
- You can catch the return values from that function an use it to decide whether to install or not.
which
is super non-portable. I frequently usecommand -v
instead, but it depends heavily on the type of name you’re looking for (alias, function, executable, &c.)
– D. Ben Knoble
Dec 23 '18 at 0:54
Super non-portable for a question that is for an Ubuntu machine? This is isn'tUnix & Linux
site! If i were answering it onUnix & Linux
site that would be a different matter!
– George Udosen
Dec 23 '18 at 13:15
add a comment |
Why do you want to check it in the first place? Unless you have a good reason for it, don't do it, just apt-get install package
over. If it's already installed it will be updated if there is a newer version available, if it is installed and it is up to date, nothing will happen. In case you have some configuration that needs to be applied, there are other options, like building an configuration package which depends on the package or using configuration management software like ansible.
Something will often happen: At least with apt, installing an already installed package will change its status from automatic to manual if it was only installed as a dependency of another package. If that other package is later removed, this package will no longer be marked for auto removal. I have a script to install an edited list of packages from a previous install into a new one. This technique keeps it from making a mess of the new system.
– Joe
Dec 27 '18 at 0:45
add a comment |
One easy way to check for installed packages using apt-mark
:
apt-mark showinstall
will list all packages marked install (already installed, or queued for installation). After that, it's a simple matter of grepping the package(s) you care about.
Example: apt-mark showinstall | grep -q "^$PACKAGE_NAME$" && echo "installed" || echo "not"
You're on the right track! Just change it to this to eliminate the false positives: apt-mark showinstall | grep -q "^$PACKAGE_NAME$" && echo "installed" || echo "not"
– Eric Mintz
Dec 22 '18 at 21:13
@EricMintz - thanks for the improvement! Edited.
– user535733
Dec 23 '18 at 1:31
add a comment |
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5 Answers
5
active
oldest
votes
5 Answers
5
active
oldest
votes
active
oldest
votes
active
oldest
votes
you can do this:
dpkg -s <packagename> &> /dev/null
then check exit status.only if the exit status of the above command was equal to 0
then the package installed.
so:
#!/bin/bash
echo "enter your package name"
read name
dpkg -s $name &> /dev/null
if [ $? -ne 0 ]
then
echo "not installed"
sudo apt-get update
sudo apt-get install $name
else
echo "installed"
fi
Really thank's! It works :D
– GUILLEM NAVALON BABIA
Dec 22 '18 at 21:13
Except it doesn't? What happened to the line withsudo apt install $name
? The command needs to go on the next line... Otherwise, nice work...
– Zanna
Dec 22 '18 at 21:30
3
Note that software could be installed in a variety of ways, anddpkg
is only relevant for installed debian packages. In OP's particular case,youtube-dl
for instance could be also installed via python's package managerpip
– Sergiy Kolodyazhnyy
Dec 22 '18 at 21:36
2
Why notif dpkg -s “$name” &> /dev/null ; then
? Same effect, cleaner/clearer imo.
– D. Ben Knoble
Dec 23 '18 at 0:52
indeed, checking the exit status is exactly whatif
does...
– Zanna
Dec 23 '18 at 10:35
|
show 1 more comment
you can do this:
dpkg -s <packagename> &> /dev/null
then check exit status.only if the exit status of the above command was equal to 0
then the package installed.
so:
#!/bin/bash
echo "enter your package name"
read name
dpkg -s $name &> /dev/null
if [ $? -ne 0 ]
then
echo "not installed"
sudo apt-get update
sudo apt-get install $name
else
echo "installed"
fi
Really thank's! It works :D
– GUILLEM NAVALON BABIA
Dec 22 '18 at 21:13
Except it doesn't? What happened to the line withsudo apt install $name
? The command needs to go on the next line... Otherwise, nice work...
– Zanna
Dec 22 '18 at 21:30
3
Note that software could be installed in a variety of ways, anddpkg
is only relevant for installed debian packages. In OP's particular case,youtube-dl
for instance could be also installed via python's package managerpip
– Sergiy Kolodyazhnyy
Dec 22 '18 at 21:36
2
Why notif dpkg -s “$name” &> /dev/null ; then
? Same effect, cleaner/clearer imo.
– D. Ben Knoble
Dec 23 '18 at 0:52
indeed, checking the exit status is exactly whatif
does...
– Zanna
Dec 23 '18 at 10:35
|
show 1 more comment
you can do this:
dpkg -s <packagename> &> /dev/null
then check exit status.only if the exit status of the above command was equal to 0
then the package installed.
so:
#!/bin/bash
echo "enter your package name"
read name
dpkg -s $name &> /dev/null
if [ $? -ne 0 ]
then
echo "not installed"
sudo apt-get update
sudo apt-get install $name
else
echo "installed"
fi
you can do this:
dpkg -s <packagename> &> /dev/null
then check exit status.only if the exit status of the above command was equal to 0
then the package installed.
so:
#!/bin/bash
echo "enter your package name"
read name
dpkg -s $name &> /dev/null
if [ $? -ne 0 ]
then
echo "not installed"
sudo apt-get update
sudo apt-get install $name
else
echo "installed"
fi
edited Dec 23 '18 at 18:24
GUILLEM NAVALON BABIA
487
487
answered Dec 22 '18 at 20:25
HosseinHossein
1014
1014
Really thank's! It works :D
– GUILLEM NAVALON BABIA
Dec 22 '18 at 21:13
Except it doesn't? What happened to the line withsudo apt install $name
? The command needs to go on the next line... Otherwise, nice work...
– Zanna
Dec 22 '18 at 21:30
3
Note that software could be installed in a variety of ways, anddpkg
is only relevant for installed debian packages. In OP's particular case,youtube-dl
for instance could be also installed via python's package managerpip
– Sergiy Kolodyazhnyy
Dec 22 '18 at 21:36
2
Why notif dpkg -s “$name” &> /dev/null ; then
? Same effect, cleaner/clearer imo.
– D. Ben Knoble
Dec 23 '18 at 0:52
indeed, checking the exit status is exactly whatif
does...
– Zanna
Dec 23 '18 at 10:35
|
show 1 more comment
Really thank's! It works :D
– GUILLEM NAVALON BABIA
Dec 22 '18 at 21:13
Except it doesn't? What happened to the line withsudo apt install $name
? The command needs to go on the next line... Otherwise, nice work...
– Zanna
Dec 22 '18 at 21:30
3
Note that software could be installed in a variety of ways, anddpkg
is only relevant for installed debian packages. In OP's particular case,youtube-dl
for instance could be also installed via python's package managerpip
– Sergiy Kolodyazhnyy
Dec 22 '18 at 21:36
2
Why notif dpkg -s “$name” &> /dev/null ; then
? Same effect, cleaner/clearer imo.
– D. Ben Knoble
Dec 23 '18 at 0:52
indeed, checking the exit status is exactly whatif
does...
– Zanna
Dec 23 '18 at 10:35
Really thank's! It works :D
– GUILLEM NAVALON BABIA
Dec 22 '18 at 21:13
Really thank's! It works :D
– GUILLEM NAVALON BABIA
Dec 22 '18 at 21:13
Except it doesn't? What happened to the line with
sudo apt install $name
? The command needs to go on the next line... Otherwise, nice work...– Zanna
Dec 22 '18 at 21:30
Except it doesn't? What happened to the line with
sudo apt install $name
? The command needs to go on the next line... Otherwise, nice work...– Zanna
Dec 22 '18 at 21:30
3
3
Note that software could be installed in a variety of ways, and
dpkg
is only relevant for installed debian packages. In OP's particular case, youtube-dl
for instance could be also installed via python's package manager pip
– Sergiy Kolodyazhnyy
Dec 22 '18 at 21:36
Note that software could be installed in a variety of ways, and
dpkg
is only relevant for installed debian packages. In OP's particular case, youtube-dl
for instance could be also installed via python's package manager pip
– Sergiy Kolodyazhnyy
Dec 22 '18 at 21:36
2
2
Why not
if dpkg -s “$name” &> /dev/null ; then
? Same effect, cleaner/clearer imo.– D. Ben Knoble
Dec 23 '18 at 0:52
Why not
if dpkg -s “$name” &> /dev/null ; then
? Same effect, cleaner/clearer imo.– D. Ben Knoble
Dec 23 '18 at 0:52
indeed, checking the exit status is exactly what
if
does...– Zanna
Dec 23 '18 at 10:35
indeed, checking the exit status is exactly what
if
does...– Zanna
Dec 23 '18 at 10:35
|
show 1 more comment
Here's a function I wrote for the purpose that I use in my scripts. It checks to see if the required package is installed and if not, prompts the user to install it. It requires a package name as a parameter. If you don't know the name of the package a required program belongs to you can look it up. Information on that available here.
function getreq {
dpkg-query --show "$1"
if [ "$?" = "0" ];
then
echo "$1" found
else
echo "$1" not found. Please approve installation.
sudo apt-get install "$1"
if [ "$?" = "0" ];
then echo "$1" installed successfully.
fi
fi
}
add a comment |
Here's a function I wrote for the purpose that I use in my scripts. It checks to see if the required package is installed and if not, prompts the user to install it. It requires a package name as a parameter. If you don't know the name of the package a required program belongs to you can look it up. Information on that available here.
function getreq {
dpkg-query --show "$1"
if [ "$?" = "0" ];
then
echo "$1" found
else
echo "$1" not found. Please approve installation.
sudo apt-get install "$1"
if [ "$?" = "0" ];
then echo "$1" installed successfully.
fi
fi
}
add a comment |
Here's a function I wrote for the purpose that I use in my scripts. It checks to see if the required package is installed and if not, prompts the user to install it. It requires a package name as a parameter. If you don't know the name of the package a required program belongs to you can look it up. Information on that available here.
function getreq {
dpkg-query --show "$1"
if [ "$?" = "0" ];
then
echo "$1" found
else
echo "$1" not found. Please approve installation.
sudo apt-get install "$1"
if [ "$?" = "0" ];
then echo "$1" installed successfully.
fi
fi
}
Here's a function I wrote for the purpose that I use in my scripts. It checks to see if the required package is installed and if not, prompts the user to install it. It requires a package name as a parameter. If you don't know the name of the package a required program belongs to you can look it up. Information on that available here.
function getreq {
dpkg-query --show "$1"
if [ "$?" = "0" ];
then
echo "$1" found
else
echo "$1" not found. Please approve installation.
sudo apt-get install "$1"
if [ "$?" = "0" ];
then echo "$1" installed successfully.
fi
fi
}
edited Dec 23 '18 at 13:52
answered Dec 22 '18 at 21:31
Elder GeekElder Geek
26.5k952126
26.5k952126
add a comment |
add a comment |
This line of command will check using the which
program and will return 0
if installed and 1
if not:
which apache | grep -o apache > /dev/null && echo 0 || echo 1
Of course you will use it in this manner in your script:
which "$1" | grep -o "$1" > /dev/null && echo "Installed!" || echo "Not Installed!"
A simple usage would be:
#!/usr/bin/env bash
set -e
function checker() {
which "$1" | grep -o "$1" > /dev/null && return 0 || return 1
}
if checker "$1" == 0 ; then echo "Installed"; else echo "Not Installed!"; fi
Note several things:
- You will have to deal with dependenciy issues while installing
- To avoid interaaction with script during install see here for examples.
- You can catch the return values from that function an use it to decide whether to install or not.
which
is super non-portable. I frequently usecommand -v
instead, but it depends heavily on the type of name you’re looking for (alias, function, executable, &c.)
– D. Ben Knoble
Dec 23 '18 at 0:54
Super non-portable for a question that is for an Ubuntu machine? This is isn'tUnix & Linux
site! If i were answering it onUnix & Linux
site that would be a different matter!
– George Udosen
Dec 23 '18 at 13:15
add a comment |
This line of command will check using the which
program and will return 0
if installed and 1
if not:
which apache | grep -o apache > /dev/null && echo 0 || echo 1
Of course you will use it in this manner in your script:
which "$1" | grep -o "$1" > /dev/null && echo "Installed!" || echo "Not Installed!"
A simple usage would be:
#!/usr/bin/env bash
set -e
function checker() {
which "$1" | grep -o "$1" > /dev/null && return 0 || return 1
}
if checker "$1" == 0 ; then echo "Installed"; else echo "Not Installed!"; fi
Note several things:
- You will have to deal with dependenciy issues while installing
- To avoid interaaction with script during install see here for examples.
- You can catch the return values from that function an use it to decide whether to install or not.
which
is super non-portable. I frequently usecommand -v
instead, but it depends heavily on the type of name you’re looking for (alias, function, executable, &c.)
– D. Ben Knoble
Dec 23 '18 at 0:54
Super non-portable for a question that is for an Ubuntu machine? This is isn'tUnix & Linux
site! If i were answering it onUnix & Linux
site that would be a different matter!
– George Udosen
Dec 23 '18 at 13:15
add a comment |
This line of command will check using the which
program and will return 0
if installed and 1
if not:
which apache | grep -o apache > /dev/null && echo 0 || echo 1
Of course you will use it in this manner in your script:
which "$1" | grep -o "$1" > /dev/null && echo "Installed!" || echo "Not Installed!"
A simple usage would be:
#!/usr/bin/env bash
set -e
function checker() {
which "$1" | grep -o "$1" > /dev/null && return 0 || return 1
}
if checker "$1" == 0 ; then echo "Installed"; else echo "Not Installed!"; fi
Note several things:
- You will have to deal with dependenciy issues while installing
- To avoid interaaction with script during install see here for examples.
- You can catch the return values from that function an use it to decide whether to install or not.
This line of command will check using the which
program and will return 0
if installed and 1
if not:
which apache | grep -o apache > /dev/null && echo 0 || echo 1
Of course you will use it in this manner in your script:
which "$1" | grep -o "$1" > /dev/null && echo "Installed!" || echo "Not Installed!"
A simple usage would be:
#!/usr/bin/env bash
set -e
function checker() {
which "$1" | grep -o "$1" > /dev/null && return 0 || return 1
}
if checker "$1" == 0 ; then echo "Installed"; else echo "Not Installed!"; fi
Note several things:
- You will have to deal with dependenciy issues while installing
- To avoid interaaction with script during install see here for examples.
- You can catch the return values from that function an use it to decide whether to install or not.
edited Dec 22 '18 at 20:49
answered Dec 22 '18 at 20:27
George UdosenGeorge Udosen
20.5k94467
20.5k94467
which
is super non-portable. I frequently usecommand -v
instead, but it depends heavily on the type of name you’re looking for (alias, function, executable, &c.)
– D. Ben Knoble
Dec 23 '18 at 0:54
Super non-portable for a question that is for an Ubuntu machine? This is isn'tUnix & Linux
site! If i were answering it onUnix & Linux
site that would be a different matter!
– George Udosen
Dec 23 '18 at 13:15
add a comment |
which
is super non-portable. I frequently usecommand -v
instead, but it depends heavily on the type of name you’re looking for (alias, function, executable, &c.)
– D. Ben Knoble
Dec 23 '18 at 0:54
Super non-portable for a question that is for an Ubuntu machine? This is isn'tUnix & Linux
site! If i were answering it onUnix & Linux
site that would be a different matter!
– George Udosen
Dec 23 '18 at 13:15
which
is super non-portable. I frequently use command -v
instead, but it depends heavily on the type of name you’re looking for (alias, function, executable, &c.)– D. Ben Knoble
Dec 23 '18 at 0:54
which
is super non-portable. I frequently use command -v
instead, but it depends heavily on the type of name you’re looking for (alias, function, executable, &c.)– D. Ben Knoble
Dec 23 '18 at 0:54
Super non-portable for a question that is for an Ubuntu machine? This is isn't
Unix & Linux
site! If i were answering it on Unix & Linux
site that would be a different matter!– George Udosen
Dec 23 '18 at 13:15
Super non-portable for a question that is for an Ubuntu machine? This is isn't
Unix & Linux
site! If i were answering it on Unix & Linux
site that would be a different matter!– George Udosen
Dec 23 '18 at 13:15
add a comment |
Why do you want to check it in the first place? Unless you have a good reason for it, don't do it, just apt-get install package
over. If it's already installed it will be updated if there is a newer version available, if it is installed and it is up to date, nothing will happen. In case you have some configuration that needs to be applied, there are other options, like building an configuration package which depends on the package or using configuration management software like ansible.
Something will often happen: At least with apt, installing an already installed package will change its status from automatic to manual if it was only installed as a dependency of another package. If that other package is later removed, this package will no longer be marked for auto removal. I have a script to install an edited list of packages from a previous install into a new one. This technique keeps it from making a mess of the new system.
– Joe
Dec 27 '18 at 0:45
add a comment |
Why do you want to check it in the first place? Unless you have a good reason for it, don't do it, just apt-get install package
over. If it's already installed it will be updated if there is a newer version available, if it is installed and it is up to date, nothing will happen. In case you have some configuration that needs to be applied, there are other options, like building an configuration package which depends on the package or using configuration management software like ansible.
Something will often happen: At least with apt, installing an already installed package will change its status from automatic to manual if it was only installed as a dependency of another package. If that other package is later removed, this package will no longer be marked for auto removal. I have a script to install an edited list of packages from a previous install into a new one. This technique keeps it from making a mess of the new system.
– Joe
Dec 27 '18 at 0:45
add a comment |
Why do you want to check it in the first place? Unless you have a good reason for it, don't do it, just apt-get install package
over. If it's already installed it will be updated if there is a newer version available, if it is installed and it is up to date, nothing will happen. In case you have some configuration that needs to be applied, there are other options, like building an configuration package which depends on the package or using configuration management software like ansible.
Why do you want to check it in the first place? Unless you have a good reason for it, don't do it, just apt-get install package
over. If it's already installed it will be updated if there is a newer version available, if it is installed and it is up to date, nothing will happen. In case you have some configuration that needs to be applied, there are other options, like building an configuration package which depends on the package or using configuration management software like ansible.
edited Dec 23 '18 at 10:33
Zanna
50.5k13133241
50.5k13133241
answered Dec 23 '18 at 3:16
user2567875user2567875
1312
1312
Something will often happen: At least with apt, installing an already installed package will change its status from automatic to manual if it was only installed as a dependency of another package. If that other package is later removed, this package will no longer be marked for auto removal. I have a script to install an edited list of packages from a previous install into a new one. This technique keeps it from making a mess of the new system.
– Joe
Dec 27 '18 at 0:45
add a comment |
Something will often happen: At least with apt, installing an already installed package will change its status from automatic to manual if it was only installed as a dependency of another package. If that other package is later removed, this package will no longer be marked for auto removal. I have a script to install an edited list of packages from a previous install into a new one. This technique keeps it from making a mess of the new system.
– Joe
Dec 27 '18 at 0:45
Something will often happen: At least with apt, installing an already installed package will change its status from automatic to manual if it was only installed as a dependency of another package. If that other package is later removed, this package will no longer be marked for auto removal. I have a script to install an edited list of packages from a previous install into a new one. This technique keeps it from making a mess of the new system.
– Joe
Dec 27 '18 at 0:45
Something will often happen: At least with apt, installing an already installed package will change its status from automatic to manual if it was only installed as a dependency of another package. If that other package is later removed, this package will no longer be marked for auto removal. I have a script to install an edited list of packages from a previous install into a new one. This technique keeps it from making a mess of the new system.
– Joe
Dec 27 '18 at 0:45
add a comment |
One easy way to check for installed packages using apt-mark
:
apt-mark showinstall
will list all packages marked install (already installed, or queued for installation). After that, it's a simple matter of grepping the package(s) you care about.
Example: apt-mark showinstall | grep -q "^$PACKAGE_NAME$" && echo "installed" || echo "not"
You're on the right track! Just change it to this to eliminate the false positives: apt-mark showinstall | grep -q "^$PACKAGE_NAME$" && echo "installed" || echo "not"
– Eric Mintz
Dec 22 '18 at 21:13
@EricMintz - thanks for the improvement! Edited.
– user535733
Dec 23 '18 at 1:31
add a comment |
One easy way to check for installed packages using apt-mark
:
apt-mark showinstall
will list all packages marked install (already installed, or queued for installation). After that, it's a simple matter of grepping the package(s) you care about.
Example: apt-mark showinstall | grep -q "^$PACKAGE_NAME$" && echo "installed" || echo "not"
You're on the right track! Just change it to this to eliminate the false positives: apt-mark showinstall | grep -q "^$PACKAGE_NAME$" && echo "installed" || echo "not"
– Eric Mintz
Dec 22 '18 at 21:13
@EricMintz - thanks for the improvement! Edited.
– user535733
Dec 23 '18 at 1:31
add a comment |
One easy way to check for installed packages using apt-mark
:
apt-mark showinstall
will list all packages marked install (already installed, or queued for installation). After that, it's a simple matter of grepping the package(s) you care about.
Example: apt-mark showinstall | grep -q "^$PACKAGE_NAME$" && echo "installed" || echo "not"
One easy way to check for installed packages using apt-mark
:
apt-mark showinstall
will list all packages marked install (already installed, or queued for installation). After that, it's a simple matter of grepping the package(s) you care about.
Example: apt-mark showinstall | grep -q "^$PACKAGE_NAME$" && echo "installed" || echo "not"
edited Dec 23 '18 at 1:30
answered Dec 22 '18 at 19:51
user535733user535733
7,87722942
7,87722942
You're on the right track! Just change it to this to eliminate the false positives: apt-mark showinstall | grep -q "^$PACKAGE_NAME$" && echo "installed" || echo "not"
– Eric Mintz
Dec 22 '18 at 21:13
@EricMintz - thanks for the improvement! Edited.
– user535733
Dec 23 '18 at 1:31
add a comment |
You're on the right track! Just change it to this to eliminate the false positives: apt-mark showinstall | grep -q "^$PACKAGE_NAME$" && echo "installed" || echo "not"
– Eric Mintz
Dec 22 '18 at 21:13
@EricMintz - thanks for the improvement! Edited.
– user535733
Dec 23 '18 at 1:31
You're on the right track! Just change it to this to eliminate the false positives: apt-mark showinstall | grep -q "^$PACKAGE_NAME$" && echo "installed" || echo "not"
– Eric Mintz
Dec 22 '18 at 21:13
You're on the right track! Just change it to this to eliminate the false positives: apt-mark showinstall | grep -q "^$PACKAGE_NAME$" && echo "installed" || echo "not"
– Eric Mintz
Dec 22 '18 at 21:13
@EricMintz - thanks for the improvement! Edited.
– user535733
Dec 23 '18 at 1:31
@EricMintz - thanks for the improvement! Edited.
– user535733
Dec 23 '18 at 1:31
add a comment |
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9
Do you intend to overwrite
/usr/bin
?– D. Ben Knoble
Dec 23 '18 at 0:51
1
Are you differentiating between package names, and executable filenames? Or want to check both? Only George's answer currently checks for executables
– Xen2050
Dec 23 '18 at 3:27
Why do you want to check it? What's the purposed use of this script?
– Braiam
Dec 23 '18 at 11:11
@Braiam At least with apt, installing an already installed package will change its status from automatic to manual if it was only installed as a dependency of another package. If that other package is later removed, this package will no longer be marked for auto removal. I have a script to install an edited list of packages from a previous install into a new one. This technique keeps it from making a mess of the new system.
– Joe
Dec 27 '18 at 0:42
@Joe which is a bad solution. You should instead just get the list of installed packages with
apt-mark showmanual
then installing with something likeapt-get install "$(< package.list)"
.– Braiam
Dec 27 '18 at 13:02