https://www.cs.princeton.edu/courses/archive/spring19/cos333...
Brian Kernighan has a knack for explaining languages very precisely and elegantly.
https://www.pement.org/awk/awk1line.txt
That author also edited the "USEFUL ONE-LINE SCRIPTS FOR SED" page:
https://www.pement.org/sed/sed1line.txt
https://www.pement.org/awk/awk1line.txt
That author also edited the "USEFUL ONE-LINE SCRIPTS FOR SED" page:
https://www.pement.org/sed/sed1line.txt