Pipe/send command to process running on nohup that accepts input from STDIN
I have a program that I run using nohup program &. This program accepts input from STDIN. Is there any way to send text to the STDIN of a program that is running via nohup?
This is on FreeBSD running bash. I would like to see how this is done on linux as well.
pipe nohup
asked Dec 21 '10 at 18:41
vivin
7561615
add a comment |
I have a program that I run using nohup program &. This program accepts input from STDIN. Is there any way to send text to the STDIN of a program that is running via nohup?
This is on FreeBSD running bash. I would like to see how this is done on linux as well.
pipe nohup
asked Dec 21 '10 at 18:41
vivin
7561615
Linux (which)? Unix (which)? OS X? AmigaOS? It probably wouldn't hurt to say which shell. Bash? Bourne? Korn? C? Z? Fish?
– Dennis Williamson
Dec 21 '10 at 18:45
Sorry about that. Updated the question.
– vivin
Dec 21 '10 at 18:54
add a comment |
I have a program that I run using nohup program &. This program accepts input from STDIN. Is there any way to send text to the STDIN of a program that is running via nohup?
This is on FreeBSD running bash. I would like to see how this is done on linux as well.
pipe nohup
asked Dec 21 '10 at 18:41
vivin
7561615
I have a program that I run using nohup program &. This program accepts input from STDIN. Is there any way to send text to the STDIN of a program that is running via nohup?
This is on FreeBSD running bash. I would like to see how this is done on linux as well.
pipe nohup
pipe nohup
asked Dec 21 '10 at 18:41
vivin
7561615
asked Dec 21 '10 at 18:41
vivin
7561615
edited Dec 21 '10 at 18:54
asked Dec 21 '10 at 18:41
vivin
7561615
asked Dec 21 '10 at 18:41
vivin
7561615
asked Dec 21 '10 at 18:41
vivin
7561615
7561615
Linux (which)? Unix (which)? OS X? AmigaOS? It probably wouldn't hurt to say which shell. Bash? Bourne? Korn? C? Z? Fish?
– Dennis Williamson
Dec 21 '10 at 18:45
Sorry about that. Updated the question.
– vivin
Dec 21 '10 at 18:54
add a comment |
Linux (which)? Unix (which)? OS X? AmigaOS? It probably wouldn't hurt to say which shell. Bash? Bourne? Korn? C? Z? Fish?
– Dennis Williamson
Dec 21 '10 at 18:45
Sorry about that. Updated the question.
– vivin
Dec 21 '10 at 18:54
Linux (which)? Unix (which)? OS X? AmigaOS? It probably wouldn't hurt to say which shell. Bash? Bourne? Korn? C? Z? Fish?
– Dennis Williamson
Dec 21 '10 at 18:45
Linux (which)? Unix (which)? OS X? AmigaOS? It probably wouldn't hurt to say which shell. Bash? Bourne? Korn? C? Z? Fish?
– Dennis Williamson
Dec 21 '10 at 18:45
Sorry about that. Updated the question.
– vivin
Dec 21 '10 at 18:54
Sorry about that. Updated the question.
– vivin
Dec 21 '10 at 18:54
add a comment |
1 Answer
1
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nohup runs the program with standard input redirected from /dev/null (assuming that you didn't redirect the nohup command itself). So no, you can't send input to this program.
If you want to send input to the program, redirect the input when you start it:
nohup program <input-file.txt & # input from a file
nohup data-producer | nohup program & # input from another program
mkfifo program.pipe; nohup program <program.pipe & # input from a named pipe, feed it what you want later
(Actually, it may be possible to reconnect the program's standard input to another source, by using ptrace, i.e. a debugger or other hack. This could crash the program if it keeps track where its input is from. See How can I pause up a running process over ssh, disown it, associate it to a new screen shell and unpause it?; there are other questions on the SE network on this topic.)
answered Dec 21 '10 at 23:28
Gilles
52.1k14113161
Won't data-producer get killed?
– wliao
Dec 5 at 18:00
1
@wliao Indeed. I've addednohupin front of it as well, thanks.
– Gilles
Dec 5 at 19:55
add a comment |
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nohup runs the program with standard input redirected from /dev/null (assuming that you didn't redirect the nohup command itself). So no, you can't send input to this program.
If you want to send input to the program, redirect the input when you start it:
nohup program <input-file.txt & # input from a file
nohup data-producer | nohup program & # input from another program
mkfifo program.pipe; nohup program <program.pipe & # input from a named pipe, feed it what you want later
(Actually, it may be possible to reconnect the program's standard input to another source, by using ptrace, i.e. a debugger or other hack. This could crash the program if it keeps track where its input is from. See How can I pause up a running process over ssh, disown it, associate it to a new screen shell and unpause it?; there are other questions on the SE network on this topic.)
answered Dec 21 '10 at 23:28
Gilles
52.1k14113161
Won't data-producer get killed?
– wliao
Dec 5 at 18:00
1
@wliao Indeed. I've addednohupin front of it as well, thanks.
– Gilles
Dec 5 at 19:55
add a comment |
nohup runs the program with standard input redirected from /dev/null (assuming that you didn't redirect the nohup command itself). So no, you can't send input to this program.
If you want to send input to the program, redirect the input when you start it:
nohup program <input-file.txt & # input from a file
nohup data-producer | nohup program & # input from another program
mkfifo program.pipe; nohup program <program.pipe & # input from a named pipe, feed it what you want later
(Actually, it may be possible to reconnect the program's standard input to another source, by using ptrace, i.e. a debugger or other hack. This could crash the program if it keeps track where its input is from. See How can I pause up a running process over ssh, disown it, associate it to a new screen shell and unpause it?; there are other questions on the SE network on this topic.)
answered Dec 21 '10 at 23:28
Gilles
52.1k14113161
Won't data-producer get killed?
– wliao
Dec 5 at 18:00
1
@wliao Indeed. I've addednohupin front of it as well, thanks.
– Gilles
Dec 5 at 19:55
add a comment |
nohup runs the program with standard input redirected from /dev/null (assuming that you didn't redirect the nohup command itself). So no, you can't send input to this program.
If you want to send input to the program, redirect the input when you start it:
nohup program <input-file.txt & # input from a file
nohup data-producer | nohup program & # input from another program
mkfifo program.pipe; nohup program <program.pipe & # input from a named pipe, feed it what you want later
(Actually, it may be possible to reconnect the program's standard input to another source, by using ptrace, i.e. a debugger or other hack. This could crash the program if it keeps track where its input is from. See How can I pause up a running process over ssh, disown it, associate it to a new screen shell and unpause it?; there are other questions on the SE network on this topic.)
answered Dec 21 '10 at 23:28
Gilles
52.1k14113161
nohup runs the program with standard input redirected from /dev/null (assuming that you didn't redirect the nohup command itself). So no, you can't send input to this program.
If you want to send input to the program, redirect the input when you start it:
nohup program <input-file.txt & # input from a file
nohup data-producer | nohup program & # input from another program
mkfifo program.pipe; nohup program <program.pipe & # input from a named pipe, feed it what you want later
(Actually, it may be possible to reconnect the program's standard input to another source, by using ptrace, i.e. a debugger or other hack. This could crash the program if it keeps track where its input is from. See How can I pause up a running process over ssh, disown it, associate it to a new screen shell and unpause it?; there are other questions on the SE network on this topic.)
answered Dec 21 '10 at 23:28
Gilles
52.1k14113161
edited Dec 5 at 19:55
answered Dec 21 '10 at 23:28
Gilles
52.1k14113161
answered Dec 21 '10 at 23:28
Gilles
52.1k14113161
answered Dec 21 '10 at 23:28
Gilles
52.1k14113161
52.1k14113161
Won't data-producer get killed?
– wliao
Dec 5 at 18:00
1
@wliao Indeed. I've addednohupin front of it as well, thanks.
– Gilles
Dec 5 at 19:55
add a comment |
Won't data-producer get killed?
– wliao
Dec 5 at 18:00
1
@wliao Indeed. I've addednohupin front of it as well, thanks.
– Gilles
Dec 5 at 19:55
Won't data-producer get killed?
– wliao
Dec 5 at 18:00
Won't data-producer get killed?
– wliao
Dec 5 at 18:00
1
1
@wliao Indeed. I've added
nohup in front of it as well, thanks.– Gilles
Dec 5 at 19:55
@wliao Indeed. I've added
nohup in front of it as well, thanks.– Gilles
Dec 5 at 19:55
add a comment |
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Linux (which)? Unix (which)? OS X? AmigaOS? It probably wouldn't hurt to say which shell. Bash? Bourne? Korn? C? Z? Fish?
– Dennis Williamson
Dec 21 '10 at 18:45
Sorry about that. Updated the question.
– vivin
Dec 21 '10 at 18:54