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Environment Variable Parent PID

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# 1  
Old 02-12-2007
Environment Variable Parent PID
I have always used the "$$" environment variable to find the current process number. Is there any similar way or perhaps something else to easily find the parent process number? I realize I could do something like ps and grep for the process and cut or awk out the parent process but I wanted to make sure I was not missing something more elegant. As always, thanks in advance.
# 2  
Old 02-12-2007
https://www.unix.com/shell-programming-and-scripting/34895-parent-shell-pid.html
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