man sed - SERP Analysis

https://linux.die.net/man/1/sed

https://www.gnu.org/software/sed/manual/sed.html

https://man7.org/linux/man-pages/man1/sed.1p.html

https://docs.oracle.com/cd/E36784_01/html/E36870/sed-1.html

https://man.cx/sed

http://man.openbsd.org/sed.1

https://man.freebsd.org/cgi/man.cgi%3Fsed

https://ss64.com/bash/sed.html

https://www.ibm.com/docs/ssw_aix_72/s_commands/sed.html

https://www.geeksforgeeks.org/linux-unix/sed-command-in-linux-unix-with-examples/