-----Original Message----- > >As I described earlier, if I had to enter: > ># pidof mysqld > Second, the pidof command prints all the pids associated with a process name on a single output line. If pidof finds the named process, the line will have one or more space-separated numbers on it. If it doesn't find the named process, it will print an empty line. It does not "return null". ----------------------------- To add to what Tony said... `pidof` will return an exit code of 1 if no processes exist, and 0 if processes do exist: # pidof Xorg 2354 # echo $? 0 # pidof mysql # echo $? 1
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