-- Get process id of current process $ echo $$ 6113 -- shows process id $ ps PID TTY TIME CMD 2050 pts/2 00:00:00 ps 6113 pts/2 00:00:00 ksh Useful when creating a unique temp file example TEMPFILE=/tmp/tmpfile.$$ -- Get process id of last background id $ sleep 10 & [1] 2078 $ echo $! … Continue reading ksh – Process →