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
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
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
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
edited Nov 14 '18 at 18:14
Omnifarious
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
Evenat 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 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.
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.
Nope, sleep still has something in theTTY
column. I did test it even though I didn't expectdisown
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
This little command line ditty results in apython3
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 |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "3"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fsuperuser.com%2fquestions%2f1375395%2fhow-do-i-detach-from-a-controlling-terminal-from-the-command-line%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
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
Evenat 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 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
Evenat 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 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
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
edited Nov 16 '18 at 0:50
answered Nov 16 '18 at 0:33
Jim L.Jim L.
37617
37617
Evenat 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 issetsid
.
– Omnifarious
Jan 22 at 0:38
add a comment |
Evenat 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 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.
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.
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.
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.
edited Jan 22 at 0:37
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.
Nope, sleep still has something in theTTY
column. I did test it even though I didn't expectdisown
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
This little command line ditty results in apython3
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 |
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.
Nope, sleep still has something in theTTY
column. I did test it even though I didn't expectdisown
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
This little command line ditty results in apython3
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 |
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.
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
701513
Nope, sleep still has something in theTTY
column. I did test it even though I didn't expectdisown
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
This little command line ditty results in apython3
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 |
Nope, sleep still has something in theTTY
column. I did test it even though I didn't expectdisown
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
This little command line ditty results in apython3
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
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 |
Thanks for contributing an answer to Super User!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fsuperuser.com%2fquestions%2f1375395%2fhow-do-i-detach-from-a-controlling-terminal-from-the-command-line%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown