Update readme.md (#68)

* Update readme.md

* Update readme.md
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@ -59,6 +59,7 @@ As a computer expert, we want to be more efficient and do our jobs better. We kn
1. [unmount USB drives](#unmount-usb-drives)
1. [format USB drives](#format-usb-drives)
1. [check USB format](#check-usb-format)
1. [run command on all files of a directory](#run-command-on-all-files-of-a-directory)
1. [Quick tips](#quick-tips)
1. [Hotkeys](#hotkeys)
1. [I can't remember these cryptic commands](#i-cant-remember-these-cryptic-commands)
@ -465,6 +466,14 @@ $ sudo mkfs.exfat /dev/sdb1
sudo fsck /dev/sdb1
```
## run command on all files of a directory
**STOP CLICKING THE FILES ONE BY ONE** :-1:
```shell
for FILE in *; do echo $FILE; done
```
## Quick tips
![CLI tips](./cli_tips.jpg)