Some of these have come up for me recently, particular sed, awk, and xargs. Xargs in particular is really gnarly and opens up a lot of possibilities from the co

Some of these have come up for me recently, particular sed, awk, and xargs. Xargs in particular is really gnarly and opens up a lot of possibilities from the command line when used in conjunction with other tools. Love it! Not a program, but another fun bash thing I've learned about recently is brace expansion: https://www.linuxjournal.com/content/bash-brace-expansion https://www.linuxjournal.com/content/bash-brace-expansion