AWK v181226

$ awk 'BEGIN { print "Don\47t Panic!" }'

# apt-get install gawk gawk-doc
$ dpkg -L gawk-doc | less
> file:///usr/share/doc/gawk-doc/gawk-html/index.html#Top

$ awk 'BEGIN { print "Don\47t Panic!" }'
$ awk -F: '{ print $1 }' /etc/passwd | sort | tee user.txt
$ awk -F: '$1 == "userxyz" { print $0 }' /etc/passwd
$ awk -F: '/userxyz|root/ { print $0 }' /etc/passwd

TUTORIALs
• tutorialspoint.com/awk/index.htm
• en.tldp.org/LDP/abs/html/sedawk.html#SEDREF