Useful CLI commands

[May]

2 minute read

These are just reminders/documentation for me because I don’t want to remember them. It is not a guide for anything, it just has commands and tricks I use when reinstalling OS or fixing someone’s computer. Please don’t copy/paste commands without knowing what they do.

GNU/Linux

Remap right alt key with context menu button (I miss the context button on my ThinkPad)

// add this to your startup script to make it permanent
xmodmap -e "keycode  108 = Menu"

awk

awk '/regex/'
awk '!/regex/'

awk 'BEGIN{a=5; b=2.5; print a+b}'
awk '{sub(/:/, "-")} 1' // substitution
awk '{gsub(/:/, "-")} 1'

Rename files in bulk using regex

for f in *.ttf; do mv "$f" "$(echo "$f" | sed s/findthis/replacewiththis/)"; done

Make VS Code remember Github credentials; Easier if you are working with multiple accounts for work and personal.
```
git config credential.helper store
```
Print exit code of previous-run program
```
echo $?
```

Android

fastboot devices
fastboot oem unlock
fastboot flash recovery twrp.img
fastboot reboot

Windows

Flush DNS

ipconfig /flushdns
ipconfig /registerdns
ipconfig /release
ipconfig /renew
netsh winsock reset

Power usage info

powercfg -energy


  * PATH manipulation

      ```
      env | grep PATH
      echo $PATH
      export PATH=<previous-paths>:<new-path>
      ```

  * List network devices
	
      ```
      arp -a
      ```

  * Virtual Box issue on Windows 10
      If you are not able to get Virtual Box in Windows, try running the following (as admin)

      ```
      dism.exe /Online /Disable-Feature:Microsoft-Hyper-V

      bcdedit /set hypervisorlaunchtype off
      ```
      Also make sure to remove the following from Windows Program and Features:
      * Hyper-V
      * Virtualizing Platform
	
  * Restart to UEFI settings

      ```
      shutdown -o -r -t 0
      ```

nodejs

Installing NPM

curl -L https://npmjs.org/install.sh | sudo sh

Clear node modules cache and install dependencies

rm node_modules -r
npm cache clean --force
npm cache verify
npm install

common CLI

youtube-dl - best audio

youtube-dl -f bestaudio --extract-audio --audio-format mp3 --audio-quality 0

termux - setting up, etc

settings file ~/.termux/termux.properties

add extra touch keyboard buttons

extra-keys = [ \
    ['ESC','|','/','HOME','UP','END','PGUP','DEL'], \
    ['TAB','CTRL','ALT','LEFT','DOWN','RIGHT','PGDN','BKSP'] \
]

reload settings
```
termux-reload-settings
```

Siva Dhayalan