linux - Bash: Get pid of a process using a different user -


i have script in bash start java program , want pid of program after executes. pid saved in text file.

right have this:

if [ "$user" == "root" ]     su $app_user -c "nohup java $java_opts  >> $log_out 2>> $log_err &"     su $app_user -c "echo $! > $pid_path/$cat.pid" else     nohup java $java_opts >> $log_out 2>> $log_err &     echo $! > "$pid_path/$cat.pid" fi

i tried doesn't work neither.

if [ "$user" == "root" ]     su $app_user -c "(nohup java $java_opts  >> $log_out 2>> $log_err &); (echo $! > $pid_path/$cat.pid)" else     nohup java $java_opts >> $log_out 2>> $log_err &     echo $! > "$pid_path/$cat.pid" fi

when run app_user works great, when run root java program starts pid file created empty.

try

su $app_user -c "nohup java $java_opts  >> $log_out 2>> $log_err & echo \$! > $pid_path/$cat.pid"

\ behind $! prevents expansion of variable, before passing su command.


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