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Top Forums Shell Programming and Scripting Bash script parallel tasks and command to wait untill complete? Post 302894981 by SriniShoo on Friday 28th of March 2014 07:39:38 AM
Old 03-28-2014
If you want to wait for all the 3 processes and also check their end status
Code:
command1 &
C1_PID="$!"
command2 &
C2_PID="$!"
command3 &
C3_PID="$!"

wait ${C1_PID}
RC1="$?"
wait ${C2_PID}
RC2="$?"
wait ${C3_PID}
RC3="$?"

 

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wait(1) 						      General Commands Manual							   wait(1)

NAME
wait - await process completion SYNOPSIS
[pid] DESCRIPTION
If no argument is specified, waits until all processes (started with of the current shell have completed, and reports on abnormal termina- tions. If a numeric argument pid is given and is the process ID of a background process, waits until that process has completed. Other- wise, if pid is not a background process, exits without waiting for any processes to complete. Because the system call must be executed in the parent process, the shell itself executes without creating a new process (see wait(2)). Command-Line Arguments supports the following command line arguments: The unsigned decimal integer process ID of a command, whose termination is to wait for. WARNINGS
Some processes in a 2-or-more-stage pipeline may not be children of the shell, and thus cannot be waited for. SEE ALSO
csh(1), ksh(1), sh-posix(1), sh(1), wait(2). STANDARDS CONFORMANCE
wait(1)
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