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It's not a command, it's a special variable which determines what value(s) the shell splits and joins strings upon. Setting it to | allows me to join $1 $2 $3 ... together like "A|B|C" so I can grep...

Apparently catalina has its port as string 2 here, but most things won't. If you want something that works for catalina, great.

Here's a tip: Instead of doing 'grep -v grep', just make it so...

{ list; } is a group command, the components of list are executed one after the other, and all stdouts of the list are piped to awk, which first sees the ps output, checks $15 (may be different in...

> /dev/null 2>&1 You need to understand the theory first and then its upto you how and where you want to apply that theory. I'll try to explain above to you.

The greater-than (>) in commands like...