How to get the exit code of a background process?
It can be done by kill -0 built-in (universal) or checking the existence of /proc/ directory (Linux specific) or using the jobs built-in ( bash specific. jobs -l also reports the pid. In this case the 3rd field of the output can be Stopped|Running|Done|Exit .
How to kill a process after a given timeout?
One way is to run the program in a subshell, and communicate with the subshell through a named pipe with the read command. This way you can check the exit status of the process being run and communicate this back through the pipe. Here’s an example of timing out the yes command after 3 seconds.
When to use timeout for longer bash code?
In case that you want to do a timeout for longer bash code, use the second option as such:
Can you print the exit code of wait alone?
You can probably get away with using wait alone almost all the time. If you had a good way to identify the commands, you could print their exit code to a tmp file and then access the specific file you’re interested in: Don’t forget to remove the tmp files.
When to capture the exit code of a spawned process?
The loop also echoes some messages to stdout indicating progress of the script. Exit the loop when the spawned command terminates. Capture and report the exit code of the spawned process. Can someone give me pointers to accomplish this?
How to shutdown a forked JVM in Maven?
After the master process of the build is shutdown by sending SIGTERM signal or pressing CTRL+C, the master process immediately sends SHUTDOWN command to every forked JVM. By default (configuration parameter shutdown=testset) forked JVM would not pick up a new test which means that the current test may still continue to run.
How to get the exit status of a child process?
Wait until the child process specified by each process ID pid or job specification jobspec exits and return the exit status of the last command waited for. If a job spec is given, all processes in the job are waited for. If no arguments are given, all currently active child processes are waited for, and the return status is zero.
What is ” Exit 2 ” from finished background job status?
What is “Exit 2”? It is exit status of ls. See man for ls: Exit status: 0 if OK, 1 if minor problems (e.g., cannot access subdirectory), 2 if serious trouble (e.g., cannot access command-line argument). I guess the reason is that you have lots of *conf files in /etc and no *conf files in /usr.
How to get the PID of a background process?
The pid of a backgrounded child process is stored in $! . You can store all child processes’ pids into an array, e.g. PIDS []. wait [-n] [jobspec or pid …] Wait until the child process specified by each process ID pid or job specification jobspec exits and return the exit status of the last command waited for.