Didn't get into Macs until they were *nix. Pre-OS X Macs didn't even have a command line let alone do simple things like:
cat .bash_history | tr '|' '\n' | awk '{print $1}' | \
egrep -o '([^/]+)$' | sort | uniq -c | sort -nr | awk '{print $2 "," $1}'
or
find . -name *.conf -print0 | xargs -0 grep -l -Z mem_limit | xargs -0 -i cp {} {}.bak

