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Single shot - this instructs the program to only return one \fIpid\fP.
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Scripts too - this causes the program to also return process id's of
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shells running the named scripts.
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Tells \fIpidof\fP to omit processes with that process id. The special
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pid \fB%PPID\fP can be used to name the parent process of the \fIpidof\fP
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program, in other words the calling shell or shell script.
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When \fIpidof\fP is invoked with a full pathname to the program it
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should find the pid of, it is reasonably safe. Otherwise it is possible