Putting a foreground process into the background from a background process
Is it possible to put a process into the background from another background process with bash?
For instance, if we have the following code:
function check_if_server_running {
while [ server_running -ne true ]
curl localhost:8000
done
bg %-
}
check_if_server_running &
./startServer
# Some other code...
Could we replace bg %- with something to make the ./startServer run in the background once it's up? Normally bg %- puts the last process in the background but it is not working for me
bash
edited Feb 9 at 0:39
Rui F Ribeiro
40.4k1479137
asked Oct 16 '18 at 0:56
User_KSUser_KS
12
add a comment |
Is it possible to put a process into the background from another background process with bash?
For instance, if we have the following code:
function check_if_server_running {
while [ server_running -ne true ]
curl localhost:8000
done
bg %-
}
check_if_server_running &
./startServer
# Some other code...
Could we replace bg %- with something to make the ./startServer run in the background once it's up? Normally bg %- puts the last process in the background but it is not working for me
bash
edited Feb 9 at 0:39
Rui F Ribeiro
40.4k1479137
asked Oct 16 '18 at 0:56
User_KSUser_KS
12
add a comment |
Is it possible to put a process into the background from another background process with bash?
For instance, if we have the following code:
function check_if_server_running {
while [ server_running -ne true ]
curl localhost:8000
done
bg %-
}
check_if_server_running &
./startServer
# Some other code...
Could we replace bg %- with something to make the ./startServer run in the background once it's up? Normally bg %- puts the last process in the background but it is not working for me
bash
edited Feb 9 at 0:39
Rui F Ribeiro
40.4k1479137
asked Oct 16 '18 at 0:56
User_KSUser_KS
12
Is it possible to put a process into the background from another background process with bash?
For instance, if we have the following code:
function check_if_server_running {
while [ server_running -ne true ]
curl localhost:8000
done
bg %-
}
check_if_server_running &
./startServer
# Some other code...
Could we replace bg %- with something to make the ./startServer run in the background once it's up? Normally bg %- puts the last process in the background but it is not working for me
bash
bash
edited Feb 9 at 0:39
Rui F Ribeiro
40.4k1479137
asked Oct 16 '18 at 0:56
User_KSUser_KS
12
edited Feb 9 at 0:39
Rui F Ribeiro
40.4k1479137
asked Oct 16 '18 at 0:56
User_KSUser_KS
12
edited Feb 9 at 0:39
Rui F Ribeiro
40.4k1479137
edited Feb 9 at 0:39
Rui F Ribeiro
40.4k1479137
edited Feb 9 at 0:39
Rui F Ribeiro
40.4k1479137
40.4k1479137
asked Oct 16 '18 at 0:56
User_KSUser_KS
12
asked Oct 16 '18 at 0:56
User_KSUser_KS
12
asked Oct 16 '18 at 0:56
User_KSUser_KS
12
12
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
No, that doesn't really work this way, since the bg and fg commands are only available in the interactive mode of the shell, which is definitely not the case when you're running a function or subshell in background already...
(Also, bg itself doesn't put a job that is already in background, it just resumes a stopped job in background, you need to stop the job first with Ctrl+Z.)
Consider reworking your code to start the server in background, then wait until it's running in foreground:
function wait_for_server_running {
while ! server_running; do
curl localhost:8000
done
}
./startServer &
wait_for_server_running
# Some other code...
That looks similar to what you were trying to achieve, right?
answered Oct 16 '18 at 4:41
filbrandenfilbranden
8,71621241
Yes I was trying to do that before, but several unrelated things where blocking me from achieving that. I'll try working around that so I can start the server like that
– User_KS
Oct 16 '18 at 16:43
@User_KS Feel free to post questions about the issues you're having with the other approach, it should be easy for you to get help with that here, since it's a fairly standard approach to it. Cheers!
– filbranden
Oct 16 '18 at 17:03
thank you. I've been having this weird issue where my server does not run when it is run from the background. Theres some weird behaviour when I try to run it from the background, but usually it starts the server and immediately exits it. I'm using Play framework, which uses NettyServer for its server implementation, but it still doesn't work. I've done digging for days now and the most likely answer I could find was that theres a SIGTTIN or SIGTTOU signal being passed
– User_KS
Oct 16 '18 at 17:08
Other people have had a similar problem before: stackoverflow.com/questions/40643208/how-to-run-sbt-as-daemon
– User_KS
Oct 16 '18 at 17:08
And since Play uses TypeSafe Activator to run, which is based on SBT, that seems to be the most likely culprit. Don't know why it isn't working though
– User_KS
Oct 16 '18 at 17:09
add a comment |
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1 Answer
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1 Answer
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active
oldest
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votes
No, that doesn't really work this way, since the bg and fg commands are only available in the interactive mode of the shell, which is definitely not the case when you're running a function or subshell in background already...
(Also, bg itself doesn't put a job that is already in background, it just resumes a stopped job in background, you need to stop the job first with Ctrl+Z.)
Consider reworking your code to start the server in background, then wait until it's running in foreground:
function wait_for_server_running {
while ! server_running; do
curl localhost:8000
done
}
./startServer &
wait_for_server_running
# Some other code...
That looks similar to what you were trying to achieve, right?
answered Oct 16 '18 at 4:41
filbrandenfilbranden
8,71621241
Yes I was trying to do that before, but several unrelated things where blocking me from achieving that. I'll try working around that so I can start the server like that
– User_KS
Oct 16 '18 at 16:43
@User_KS Feel free to post questions about the issues you're having with the other approach, it should be easy for you to get help with that here, since it's a fairly standard approach to it. Cheers!
– filbranden
Oct 16 '18 at 17:03
thank you. I've been having this weird issue where my server does not run when it is run from the background. Theres some weird behaviour when I try to run it from the background, but usually it starts the server and immediately exits it. I'm using Play framework, which uses NettyServer for its server implementation, but it still doesn't work. I've done digging for days now and the most likely answer I could find was that theres a SIGTTIN or SIGTTOU signal being passed
– User_KS
Oct 16 '18 at 17:08
Other people have had a similar problem before: stackoverflow.com/questions/40643208/how-to-run-sbt-as-daemon
– User_KS
Oct 16 '18 at 17:08
And since Play uses TypeSafe Activator to run, which is based on SBT, that seems to be the most likely culprit. Don't know why it isn't working though
– User_KS
Oct 16 '18 at 17:09
add a comment |
No, that doesn't really work this way, since the bg and fg commands are only available in the interactive mode of the shell, which is definitely not the case when you're running a function or subshell in background already...
(Also, bg itself doesn't put a job that is already in background, it just resumes a stopped job in background, you need to stop the job first with Ctrl+Z.)
Consider reworking your code to start the server in background, then wait until it's running in foreground:
function wait_for_server_running {
while ! server_running; do
curl localhost:8000
done
}
./startServer &
wait_for_server_running
# Some other code...
That looks similar to what you were trying to achieve, right?
answered Oct 16 '18 at 4:41
filbrandenfilbranden
8,71621241
Yes I was trying to do that before, but several unrelated things where blocking me from achieving that. I'll try working around that so I can start the server like that
– User_KS
Oct 16 '18 at 16:43
@User_KS Feel free to post questions about the issues you're having with the other approach, it should be easy for you to get help with that here, since it's a fairly standard approach to it. Cheers!
– filbranden
Oct 16 '18 at 17:03
thank you. I've been having this weird issue where my server does not run when it is run from the background. Theres some weird behaviour when I try to run it from the background, but usually it starts the server and immediately exits it. I'm using Play framework, which uses NettyServer for its server implementation, but it still doesn't work. I've done digging for days now and the most likely answer I could find was that theres a SIGTTIN or SIGTTOU signal being passed
– User_KS
Oct 16 '18 at 17:08
Other people have had a similar problem before: stackoverflow.com/questions/40643208/how-to-run-sbt-as-daemon
– User_KS
Oct 16 '18 at 17:08
And since Play uses TypeSafe Activator to run, which is based on SBT, that seems to be the most likely culprit. Don't know why it isn't working though
– User_KS
Oct 16 '18 at 17:09
add a comment |
No, that doesn't really work this way, since the bg and fg commands are only available in the interactive mode of the shell, which is definitely not the case when you're running a function or subshell in background already...
(Also, bg itself doesn't put a job that is already in background, it just resumes a stopped job in background, you need to stop the job first with Ctrl+Z.)
Consider reworking your code to start the server in background, then wait until it's running in foreground:
function wait_for_server_running {
while ! server_running; do
curl localhost:8000
done
}
./startServer &
wait_for_server_running
# Some other code...
That looks similar to what you were trying to achieve, right?
answered Oct 16 '18 at 4:41
filbrandenfilbranden
8,71621241
No, that doesn't really work this way, since the bg and fg commands are only available in the interactive mode of the shell, which is definitely not the case when you're running a function or subshell in background already...
(Also, bg itself doesn't put a job that is already in background, it just resumes a stopped job in background, you need to stop the job first with Ctrl+Z.)
Consider reworking your code to start the server in background, then wait until it's running in foreground:
function wait_for_server_running {
while ! server_running; do
curl localhost:8000
done
}
./startServer &
wait_for_server_running
# Some other code...
That looks similar to what you were trying to achieve, right?
answered Oct 16 '18 at 4:41
filbrandenfilbranden
8,71621241
answered Oct 16 '18 at 4:41
filbrandenfilbranden
8,71621241
answered Oct 16 '18 at 4:41
filbrandenfilbranden
8,71621241
answered Oct 16 '18 at 4:41
filbrandenfilbranden
8,71621241
8,71621241
Yes I was trying to do that before, but several unrelated things where blocking me from achieving that. I'll try working around that so I can start the server like that
– User_KS
Oct 16 '18 at 16:43
@User_KS Feel free to post questions about the issues you're having with the other approach, it should be easy for you to get help with that here, since it's a fairly standard approach to it. Cheers!
– filbranden
Oct 16 '18 at 17:03
thank you. I've been having this weird issue where my server does not run when it is run from the background. Theres some weird behaviour when I try to run it from the background, but usually it starts the server and immediately exits it. I'm using Play framework, which uses NettyServer for its server implementation, but it still doesn't work. I've done digging for days now and the most likely answer I could find was that theres a SIGTTIN or SIGTTOU signal being passed
– User_KS
Oct 16 '18 at 17:08
Other people have had a similar problem before: stackoverflow.com/questions/40643208/how-to-run-sbt-as-daemon
– User_KS
Oct 16 '18 at 17:08
And since Play uses TypeSafe Activator to run, which is based on SBT, that seems to be the most likely culprit. Don't know why it isn't working though
– User_KS
Oct 16 '18 at 17:09
add a comment |
Yes I was trying to do that before, but several unrelated things where blocking me from achieving that. I'll try working around that so I can start the server like that
– User_KS
Oct 16 '18 at 16:43
@User_KS Feel free to post questions about the issues you're having with the other approach, it should be easy for you to get help with that here, since it's a fairly standard approach to it. Cheers!
– filbranden
Oct 16 '18 at 17:03
thank you. I've been having this weird issue where my server does not run when it is run from the background. Theres some weird behaviour when I try to run it from the background, but usually it starts the server and immediately exits it. I'm using Play framework, which uses NettyServer for its server implementation, but it still doesn't work. I've done digging for days now and the most likely answer I could find was that theres a SIGTTIN or SIGTTOU signal being passed
– User_KS
Oct 16 '18 at 17:08
Other people have had a similar problem before: stackoverflow.com/questions/40643208/how-to-run-sbt-as-daemon
– User_KS
Oct 16 '18 at 17:08
And since Play uses TypeSafe Activator to run, which is based on SBT, that seems to be the most likely culprit. Don't know why it isn't working though
– User_KS
Oct 16 '18 at 17:09
Yes I was trying to do that before, but several unrelated things where blocking me from achieving that. I'll try working around that so I can start the server like that
– User_KS
Oct 16 '18 at 16:43
Yes I was trying to do that before, but several unrelated things where blocking me from achieving that. I'll try working around that so I can start the server like that
– User_KS
Oct 16 '18 at 16:43
@User_KS Feel free to post questions about the issues you're having with the other approach, it should be easy for you to get help with that here, since it's a fairly standard approach to it. Cheers!
– filbranden
Oct 16 '18 at 17:03
@User_KS Feel free to post questions about the issues you're having with the other approach, it should be easy for you to get help with that here, since it's a fairly standard approach to it. Cheers!
– filbranden
Oct 16 '18 at 17:03
thank you. I've been having this weird issue where my server does not run when it is run from the background. Theres some weird behaviour when I try to run it from the background, but usually it starts the server and immediately exits it. I'm using Play framework, which uses NettyServer for its server implementation, but it still doesn't work. I've done digging for days now and the most likely answer I could find was that theres a SIGTTIN or SIGTTOU signal being passed
– User_KS
Oct 16 '18 at 17:08
thank you. I've been having this weird issue where my server does not run when it is run from the background. Theres some weird behaviour when I try to run it from the background, but usually it starts the server and immediately exits it. I'm using Play framework, which uses NettyServer for its server implementation, but it still doesn't work. I've done digging for days now and the most likely answer I could find was that theres a SIGTTIN or SIGTTOU signal being passed
– User_KS
Oct 16 '18 at 17:08
Other people have had a similar problem before: stackoverflow.com/questions/40643208/how-to-run-sbt-as-daemon
– User_KS
Oct 16 '18 at 17:08
Other people have had a similar problem before: stackoverflow.com/questions/40643208/how-to-run-sbt-as-daemon
– User_KS
Oct 16 '18 at 17:08
And since Play uses TypeSafe Activator to run, which is based on SBT, that seems to be the most likely culprit. Don't know why it isn't working though
– User_KS
Oct 16 '18 at 17:09
And since Play uses TypeSafe Activator to run, which is based on SBT, that seems to be the most likely culprit. Don't know why it isn't working though
– User_KS
Oct 16 '18 at 17:09
add a comment |
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