Awk
Notice, not all versions of awk are the same. GNU awk has some extra functionalities, mawk is faster.
http://www.theunixschool.com/2012/05/awk-match-pattern-in-file-in-linux.html
https://www.funtoo.org/Awk_by_Example,_Part_1
Notice, not all versions of awk are the same. GNU awk has some extra functionalities, mawk is faster.
http://www.theunixschool.com/2012/05/awk-match-pattern-in-file-in-linux.html
https://www.funtoo.org/Awk_by_Example,_Part_1