What's your favorite terminal hack/alias/function?

Making a directory and then immediately navigating into it is such a common occurrence, eventually on stackoverflow I found this:

alias mkcd='{ IFS= read -r d && mkdir "$d" && cd "$d"; } <<<'

A have it so that my shell always opens tmux, unless it's a login shell or dumb shell.

# ~/.bashrc
## Top of your RC
[[ $- != *i* ]] && return          # If not running interactively, don't do anything
[ -z "$PS1" ] && return            # If not running interactively, don't do anything
[[ $TERM == dumb ]] && return      # If called from emacs, don't do anything

## Put the rest of your code here

## Bottom of RC
shopt -q login_shell && return       ## If this is a login shell, load all except tmux

if command -v tmux &> /dev/null && [ -n "$PS1" ] && [[ ! "$TERM" =~ screen ]] && [[ ! "$TERM" =~ tmux ]] && [ -z "$TMUX" ]; then
    tmux attach || exec tmux new-session 
fi

That way, I always have persistent terminal sessions and don't need a terminal emulator that has tabs since I can just do multiplexing in tmux

I have an alias venv, which checks if "./.venv" exists, and if not, creates a virtualenv there, and then activates it.

Kitty’s builtin functions are pretty darn useful. I use the icat & ssh functions daily as well as the Unicode insert (tho I wish they would strip that ‘Nerd Font’ noise). Also still a long-time fan of fish’s completions.