rlwrap

adds history & ctrl support to REPLs that don’t already have them

(rl stands for readline)

$ rlwrap python

watch

rerun a command every 2 second

file

figures out what kind of file (png? pdf?) a file is

pv

“pipe viewer”, gives you stats on data going through a pipe

cal

a tiny calendar (heart)

ts

add a timestamp in front of every input line

comm

find lines 2 sorted files have in common

ncdu

figure out what’s using all your disk space

column

format input into columns

diff

diff 2 files. Run with -U 8 for context.

xsel/xclip

copy/paste from system clipboard

(pbcopy/pbpaste on Mac)