a 'window manager' inside the terminal

have processes running in the background and 'reattach' to them

make several sets of CLI 'windows' that are related to eachother

tmux

autocompletes what you've done before relatively intelligently

also autocompletes based on context, like filesystem and git state

fish

all the other small applications lige 'head', 'tail', 'less' ...

https://github.com/rand00/linux-everyday-scripts/tree/master/fegrep

fegrep: search for files whos content matches some regular expression