Absolutely essential: learn these first:
```
cd ls cp rm mv cat less
```
Help on stuff:
```
man
``` 

Making better use of the terminal:
```
tmux
```

Editors I use daily:
```
vi vim nvim
```

Scripting stuff:
```
python (for when bash gets awkward)
```

Text manipulation (inside pipelines -- learn about |)
```
cut sed awk
```

Clipboard access:
```
in X11: xsel
in Wayland: wlcopy/wlpaste
```
I have two custom commands `pp` (for paste) and `pc` (for copy)
which on Windows/cygwin Windows/wsl Linux/x11 Linux/wayland
Macos, run the appropriate copy/paste command, and given files
as arguments, copy from/paste to those files. The beauty
of scripts and functions.

Then in bash learn functions:
```
hello() { echo "Hello World"; }
```
functions let you write your own shorthands,
which makes you more efficient.

Then for and if:
```
for s in *.txt; do
  echo "$s is a text file"
done
```
```
if [ -e "mrflibble" ]; then echo "mrflibble exists"; fi
```
or
```
[ -e "mrflibble" ] && echo "mrflibble exists"
```

the `-e mrflibble` evaluates whether or not `mrflibble` exists.
See `man test` or more.