panel 1: ctrl + r

search your history!
I use this constantly to rerun commands

panel 2: magical braces

$ convert file.{jpg,png}
expands to
$ convert file.jpg file.png

{1..5} expands to 1 2 3 4 5
(for i in {1..100}…)

panel 3: !!

expands to the last command run
$ sudo !!

panel 4:

commands that start with a space don’t go in your history. good if there’s a password

panel 5: loops

for i in *.png  
do  
convert $i $i.jpg
done

person: for loops: easy & useful!

panel 6: $ ( )

gives the output of a command

$touch file- $ (date -1)
create a file named file-2018-05-25

panel 7: more keyboard shortcuts

ctrl + a beginning of line
ctrl + e end of line
ctrl + l clear the screen

& lots more emacs shortcuts too!