How do I detach from a controlling terminal from the command line?
I know about nohup and it won't do what I want:
Example:
$ nohup sleep 600 2>/dev/null >/dev/null </dev/null&
[1] 21844
$ ps -ef | fgrep -e 'sleep
> TTY'
UID PID PPID C STIME TTY TIME CMD
me 21844 19313 0 09:37 pts/9 00:00:00 sleep 600
As you can see, sleep still has pts/9 as a controlling terminal. I don't want it to have any controlling terminal. Partly because the program I want to use (it isn't sleep if you haven't guessed) tries to open the controlling terminal to ask me questions and I want to see how it behaves if it can't. How do I make this happen?
linux bash job-control
asked Nov 14 '18 at 17:41
OmnifariousOmnifarious
450417
add a comment |
I know about nohup and it won't do what I want:
Example:
$ nohup sleep 600 2>/dev/null >/dev/null </dev/null&
[1] 21844
$ ps -ef | fgrep -e 'sleep
> TTY'
UID PID PPID C STIME TTY TIME CMD
me 21844 19313 0 09:37 pts/9 00:00:00 sleep 600
As you can see, sleep still has pts/9 as a controlling terminal. I don't want it to have any controlling terminal. Partly because the program I want to use (it isn't sleep if you haven't guessed) tries to open the controlling terminal to ask me questions and I want to see how it behaves if it can't. How do I make this happen?
linux bash job-control
asked Nov 14 '18 at 17:41
OmnifariousOmnifarious
450417
add a comment |
I know about nohup and it won't do what I want:
Example:
$ nohup sleep 600 2>/dev/null >/dev/null </dev/null&
[1] 21844
$ ps -ef | fgrep -e 'sleep
> TTY'
UID PID PPID C STIME TTY TIME CMD
me 21844 19313 0 09:37 pts/9 00:00:00 sleep 600
As you can see, sleep still has pts/9 as a controlling terminal. I don't want it to have any controlling terminal. Partly because the program I want to use (it isn't sleep if you haven't guessed) tries to open the controlling terminal to ask me questions and I want to see how it behaves if it can't. How do I make this happen?
linux bash job-control
asked Nov 14 '18 at 17:41
OmnifariousOmnifarious
450417
I know about nohup and it won't do what I want:
Example:
$ nohup sleep 600 2>/dev/null >/dev/null </dev/null&
[1] 21844
$ ps -ef | fgrep -e 'sleep
> TTY'
UID PID PPID C STIME TTY TIME CMD
me 21844 19313 0 09:37 pts/9 00:00:00 sleep 600
As you can see, sleep still has pts/9 as a controlling terminal. I don't want it to have any controlling terminal. Partly because the program I want to use (it isn't sleep if you haven't guessed) tries to open the controlling terminal to ask me questions and I want to see how it behaves if it can't. How do I make this happen?
linux bash job-control
linux bash job-control
asked Nov 14 '18 at 17:41
OmnifariousOmnifarious
450417
asked Nov 14 '18 at 17:41
OmnifariousOmnifarious
450417
edited Nov 14 '18 at 18:14
Omnifarious
asked Nov 14 '18 at 17:41
OmnifariousOmnifarious
450417
asked Nov 14 '18 at 17:41
OmnifariousOmnifarious
450417
asked Nov 14 '18 at 17:41
OmnifariousOmnifarious
450417
450417
add a comment |
add a comment |
3 Answers
3
active
oldest
votes
This is a FreeBSD solution, but perhaps a similar technique will work for your OS.
I know cron isn't exactly the command line, but if you have a specific command list you want to run, cron can do that. You'll likely want to avoid having cron run the job repeatedly, perhaps by crafting a wrapper around your desired command list, something like:
#!/bin/sh
[ -f /tmp/my-semaphore-file ] || {
touch /tmp/my-semaphore-file
my_command_stack > /dev/null 2>&1
}
Inelegant perhaps for production use, but if you just want to test how your command stack performs with no controlling terminal, that will do it. The wrapper will not allow cron to run the command again until you:
rm /tmp/my-semaphore-file
at(1) is also an option, and is "almost" a command-line solution:
echo 'my_command_stack > /dev/null 2>&1' | at now+1 minute
answered Nov 16 '18 at 0:33
Jim L.Jim L.
37617
Evenat nowworks. This is better than my "You can't do it." answer.
– Omnifarious
Nov 16 '18 at 16:07
A better answer to this question issetsid.
– Omnifarious
Jan 22 at 0:38
add a comment |
The utility setsid on Linux can do this. On Fedora it's part of the util-linux package. This is the same package that contains things like mount, mkfs, /usr/bin/kill, and other similar things.
answered Nov 15 '18 at 21:52
OmnifariousOmnifarious
450417
add a comment |
You need to also use disown to detach the process from the tty.
https://unix.stackexchange.com/questions/3886/difference-between-nohup-disown-and
Try running nohup sleep 600 2>/dev/null >/dev/null </dev/null& disown and see if that gives you the desired result.
answered Nov 14 '18 at 18:38
zymhanzymhan
701513
Nope, sleep still has something in theTTYcolumn. I did test it even though I didn't expectdisownto have an effect. Dropping the controlling terminal is something that has to be done when a process is started AFAIK.
– Omnifarious
Nov 14 '18 at 18:40
Ah yes looking at this post it would appear that disown doesn't fix that after all: superuser.com/questions/1196406/…
– zymhan
Nov 14 '18 at 18:43
This little command line ditty results in apython3process with no controlling terminal:sh -c 'nohup python3 -c "import os, time; time.sleep(5); os.setsid(); time.sleep(600)" &' </dev/null >/dev/null 2>/dev/null &
– Omnifarious
Nov 14 '18 at 18:56
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
This is a FreeBSD solution, but perhaps a similar technique will work for your OS.
I know cron isn't exactly the command line, but if you have a specific command list you want to run, cron can do that. You'll likely want to avoid having cron run the job repeatedly, perhaps by crafting a wrapper around your desired command list, something like:
#!/bin/sh
[ -f /tmp/my-semaphore-file ] || {
touch /tmp/my-semaphore-file
my_command_stack > /dev/null 2>&1
}
Inelegant perhaps for production use, but if you just want to test how your command stack performs with no controlling terminal, that will do it. The wrapper will not allow cron to run the command again until you:
rm /tmp/my-semaphore-file
at(1) is also an option, and is "almost" a command-line solution:
echo 'my_command_stack > /dev/null 2>&1' | at now+1 minute
answered Nov 16 '18 at 0:33
Jim L.Jim L.
37617
Evenat nowworks. This is better than my "You can't do it." answer.
– Omnifarious
Nov 16 '18 at 16:07
A better answer to this question issetsid.
– Omnifarious
Jan 22 at 0:38
add a comment |
This is a FreeBSD solution, but perhaps a similar technique will work for your OS.
I know cron isn't exactly the command line, but if you have a specific command list you want to run, cron can do that. You'll likely want to avoid having cron run the job repeatedly, perhaps by crafting a wrapper around your desired command list, something like:
#!/bin/sh
[ -f /tmp/my-semaphore-file ] || {
touch /tmp/my-semaphore-file
my_command_stack > /dev/null 2>&1
}
Inelegant perhaps for production use, but if you just want to test how your command stack performs with no controlling terminal, that will do it. The wrapper will not allow cron to run the command again until you:
rm /tmp/my-semaphore-file
at(1) is also an option, and is "almost" a command-line solution:
echo 'my_command_stack > /dev/null 2>&1' | at now+1 minute
answered Nov 16 '18 at 0:33
Jim L.Jim L.
37617
Evenat nowworks. This is better than my "You can't do it." answer.
– Omnifarious
Nov 16 '18 at 16:07
A better answer to this question issetsid.
– Omnifarious
Jan 22 at 0:38
add a comment |
This is a FreeBSD solution, but perhaps a similar technique will work for your OS.
I know cron isn't exactly the command line, but if you have a specific command list you want to run, cron can do that. You'll likely want to avoid having cron run the job repeatedly, perhaps by crafting a wrapper around your desired command list, something like:
#!/bin/sh
[ -f /tmp/my-semaphore-file ] || {
touch /tmp/my-semaphore-file
my_command_stack > /dev/null 2>&1
}
Inelegant perhaps for production use, but if you just want to test how your command stack performs with no controlling terminal, that will do it. The wrapper will not allow cron to run the command again until you:
rm /tmp/my-semaphore-file
at(1) is also an option, and is "almost" a command-line solution:
echo 'my_command_stack > /dev/null 2>&1' | at now+1 minute
answered Nov 16 '18 at 0:33
Jim L.Jim L.
37617
This is a FreeBSD solution, but perhaps a similar technique will work for your OS.
I know cron isn't exactly the command line, but if you have a specific command list you want to run, cron can do that. You'll likely want to avoid having cron run the job repeatedly, perhaps by crafting a wrapper around your desired command list, something like:
#!/bin/sh
[ -f /tmp/my-semaphore-file ] || {
touch /tmp/my-semaphore-file
my_command_stack > /dev/null 2>&1
}
Inelegant perhaps for production use, but if you just want to test how your command stack performs with no controlling terminal, that will do it. The wrapper will not allow cron to run the command again until you:
rm /tmp/my-semaphore-file
at(1) is also an option, and is "almost" a command-line solution:
echo 'my_command_stack > /dev/null 2>&1' | at now+1 minute
answered Nov 16 '18 at 0:33
Jim L.Jim L.
37617
edited Nov 16 '18 at 0:50
answered Nov 16 '18 at 0:33
Jim L.Jim L.
37617
answered Nov 16 '18 at 0:33
Jim L.Jim L.
37617
answered Nov 16 '18 at 0:33
Jim L.Jim L.
37617
37617
Evenat nowworks. This is better than my "You can't do it." answer.
– Omnifarious
Nov 16 '18 at 16:07
A better answer to this question issetsid.
– Omnifarious
Jan 22 at 0:38
add a comment |
Evenat nowworks. This is better than my "You can't do it." answer.
– Omnifarious
Nov 16 '18 at 16:07
A better answer to this question issetsid.
– Omnifarious
Jan 22 at 0:38
Even
at now works. This is better than my "You can't do it." answer.– Omnifarious
Nov 16 '18 at 16:07
Even
at now works. This is better than my "You can't do it." answer.– Omnifarious
Nov 16 '18 at 16:07
A better answer to this question is
setsid.– Omnifarious
Jan 22 at 0:38
A better answer to this question is
setsid.– Omnifarious
Jan 22 at 0:38
add a comment |
The utility setsid on Linux can do this. On Fedora it's part of the util-linux package. This is the same package that contains things like mount, mkfs, /usr/bin/kill, and other similar things.
answered Nov 15 '18 at 21:52
OmnifariousOmnifarious
450417
add a comment |
The utility setsid on Linux can do this. On Fedora it's part of the util-linux package. This is the same package that contains things like mount, mkfs, /usr/bin/kill, and other similar things.
answered Nov 15 '18 at 21:52
OmnifariousOmnifarious
450417
add a comment |
The utility setsid on Linux can do this. On Fedora it's part of the util-linux package. This is the same package that contains things like mount, mkfs, /usr/bin/kill, and other similar things.
answered Nov 15 '18 at 21:52
OmnifariousOmnifarious
450417
The utility setsid on Linux can do this. On Fedora it's part of the util-linux package. This is the same package that contains things like mount, mkfs, /usr/bin/kill, and other similar things.
answered Nov 15 '18 at 21:52
OmnifariousOmnifarious
450417
edited Jan 22 at 0:37
answered Nov 15 '18 at 21:52
OmnifariousOmnifarious
450417
answered Nov 15 '18 at 21:52
OmnifariousOmnifarious
450417
answered Nov 15 '18 at 21:52
OmnifariousOmnifarious
450417
450417
add a comment |
add a comment |
You need to also use disown to detach the process from the tty.
https://unix.stackexchange.com/questions/3886/difference-between-nohup-disown-and
Try running nohup sleep 600 2>/dev/null >/dev/null </dev/null& disown and see if that gives you the desired result.
answered Nov 14 '18 at 18:38
zymhanzymhan
701513
Nope, sleep still has something in theTTYcolumn. I did test it even though I didn't expectdisownto have an effect. Dropping the controlling terminal is something that has to be done when a process is started AFAIK.
– Omnifarious
Nov 14 '18 at 18:40
Ah yes looking at this post it would appear that disown doesn't fix that after all: superuser.com/questions/1196406/…
– zymhan
Nov 14 '18 at 18:43
This little command line ditty results in apython3process with no controlling terminal:sh -c 'nohup python3 -c "import os, time; time.sleep(5); os.setsid(); time.sleep(600)" &' </dev/null >/dev/null 2>/dev/null &
– Omnifarious
Nov 14 '18 at 18:56
add a comment |
You need to also use disown to detach the process from the tty.
https://unix.stackexchange.com/questions/3886/difference-between-nohup-disown-and
Try running nohup sleep 600 2>/dev/null >/dev/null </dev/null& disown and see if that gives you the desired result.
answered Nov 14 '18 at 18:38
zymhanzymhan
701513
Nope, sleep still has something in theTTYcolumn. I did test it even though I didn't expectdisownto have an effect. Dropping the controlling terminal is something that has to be done when a process is started AFAIK.
– Omnifarious
Nov 14 '18 at 18:40
Ah yes looking at this post it would appear that disown doesn't fix that after all: superuser.com/questions/1196406/…
– zymhan
Nov 14 '18 at 18:43
This little command line ditty results in apython3process with no controlling terminal:sh -c 'nohup python3 -c "import os, time; time.sleep(5); os.setsid(); time.sleep(600)" &' </dev/null >/dev/null 2>/dev/null &
– Omnifarious
Nov 14 '18 at 18:56
add a comment |
You need to also use disown to detach the process from the tty.
https://unix.stackexchange.com/questions/3886/difference-between-nohup-disown-and
Try running nohup sleep 600 2>/dev/null >/dev/null </dev/null& disown and see if that gives you the desired result.
answered Nov 14 '18 at 18:38
zymhanzymhan
701513
You need to also use disown to detach the process from the tty.
https://unix.stackexchange.com/questions/3886/difference-between-nohup-disown-and
Try running nohup sleep 600 2>/dev/null >/dev/null </dev/null& disown and see if that gives you the desired result.
answered Nov 14 '18 at 18:38
zymhanzymhan
701513
answered Nov 14 '18 at 18:38
zymhanzymhan
701513
answered Nov 14 '18 at 18:38
zymhanzymhan
701513
answered Nov 14 '18 at 18:38
zymhanzymhan
701513
701513
Nope, sleep still has something in theTTYcolumn. I did test it even though I didn't expectdisownto have an effect. Dropping the controlling terminal is something that has to be done when a process is started AFAIK.
– Omnifarious
Nov 14 '18 at 18:40
Ah yes looking at this post it would appear that disown doesn't fix that after all: superuser.com/questions/1196406/…
– zymhan
Nov 14 '18 at 18:43
This little command line ditty results in apython3process with no controlling terminal:sh -c 'nohup python3 -c "import os, time; time.sleep(5); os.setsid(); time.sleep(600)" &' </dev/null >/dev/null 2>/dev/null &
– Omnifarious
Nov 14 '18 at 18:56
add a comment |
Nope, sleep still has something in theTTYcolumn. I did test it even though I didn't expectdisownto have an effect. Dropping the controlling terminal is something that has to be done when a process is started AFAIK.
– Omnifarious
Nov 14 '18 at 18:40
Ah yes looking at this post it would appear that disown doesn't fix that after all: superuser.com/questions/1196406/…
– zymhan
Nov 14 '18 at 18:43
This little command line ditty results in apython3process with no controlling terminal:sh -c 'nohup python3 -c "import os, time; time.sleep(5); os.setsid(); time.sleep(600)" &' </dev/null >/dev/null 2>/dev/null &
– Omnifarious
Nov 14 '18 at 18:56
Nope, sleep still has something in the
TTY column. I did test it even though I didn't expect disown to have an effect. Dropping the controlling terminal is something that has to be done when a process is started AFAIK.– Omnifarious
Nov 14 '18 at 18:40
Nope, sleep still has something in the
TTY column. I did test it even though I didn't expect disown to have an effect. Dropping the controlling terminal is something that has to be done when a process is started AFAIK.– Omnifarious
Nov 14 '18 at 18:40
Ah yes looking at this post it would appear that disown doesn't fix that after all: superuser.com/questions/1196406/…
– zymhan
Nov 14 '18 at 18:43
Ah yes looking at this post it would appear that disown doesn't fix that after all: superuser.com/questions/1196406/…
– zymhan
Nov 14 '18 at 18:43
This little command line ditty results in a
python3 process with no controlling terminal: sh -c 'nohup python3 -c "import os, time; time.sleep(5); os.setsid(); time.sleep(600)" &' </dev/null >/dev/null 2>/dev/null &– Omnifarious
Nov 14 '18 at 18:56
This little command line ditty results in a
python3 process with no controlling terminal: sh -c 'nohup python3 -c "import os, time; time.sleep(5); os.setsid(); time.sleep(600)" &' </dev/null >/dev/null 2>/dev/null &– Omnifarious
Nov 14 '18 at 18:56
add a comment |
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