07-17-2006
In nawk, using -v allows you to pass a shell variable to the awk command as an awk variable. I am passing the $$ (pid of the shell script in this case) as the awk variable.
Then inside the nawk, the !/ps/ and !/nawk/ make sure that the ps and the nawk commands do not match (it will not really matter if they do). The awk itself, checks for a process that has the process id of the shell script as its parent process id (the third field in the ps -ef command is the ppid). In this case, the two tail -f commands will show up.
Hope that helps.
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