[SOLVED] shell shell to execute commands for pgrep
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pgrep qemu will return the pids of the processes
for p in `pgrep qemu` will construct a loop and p will be set to every pid one by one. see the man page of bash, how it works
$p is the value of the variable p - inside the loop.
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Except that values of variables within the loop are lost after it ends. It would rather be best to use named pipes with bash instead:
Absolutely correct. Actually, I went with the piped form because I wasn't sure which shell the OP was using, and because the command inside the loop was stand-alone, so the variable didn't appear to be needed elsewhere. I was feeling a bit lazy and didn't feel like posting both versions, so I chose to stick with the portable one.