退出非root用户的ssh后，如何保持Linux程序运行？

Question

I've searched, googled, sat in IRC for a week and even talked to a friend who is devoutly aligned with linux but I haven't yet received a solid answer.

I have written a shell script that runs as soon as I log into my non-root user and runs basically just does "./myprogram &" without quotation. When I exit shh my program times out and I am unable to connect to it until I log back in. How can I keep my program running after I exit SSH of my non-root user?

I am curious if this has to be done on the program level or what? My apologizes if this does not belong here, I am not sure where it goes to be perfectly honest.

Answer 1

Beside using nohup , you can run your program in terminal multiplexer like screen or tmux . With them, you can reattach to sessions, which is for example quite helpful if you need to run terminal-based interactive programs or long time running scripts over a unstable ssh connections.

boybu is a nice enhancement of screen .

Answer 2

Try nohup: http://linux.die.net/man/1/nohup

Likely your program receives a SIGHUP signal when you exit your ssh session.

Answer 3

There's two signals that can cause your program to die after your ssh session ends: SIGHUP and SIGPIPE .

SIGHUP will be sent to your program because the parent process ( ssh ) has died. You can get around this either by using the program nohup (ie nohup ./myprogram & ) or by using the shell builtin disown ( ./myprogram& disown )

SIGPIPE will be sent to your program if it tries to write to stdout or stderr after the ssh session has been disconnected. To get around this, redirect them to a file or /dev/null , ie nohup ./myprogram >/dev/null 2>/dev/null &

Answer 4

You might also want to use the batch (or at ) command, in addition to the other answers ( nohup , screen , ...). And ssh has a -f option which might interest you.