Various linux commands I've found helpful at one time or another

nixcom.sh

# My preferred ls outputs
ls -Alh --group-directories-first

# Find and remove multiple files with same extension (careful!)
find . -type f -name "*.txt" -exec rm -f {} \;

# You can first view your current default audio device by typing:
pactl stat 

# To check the current swappiness value: 
$ cat /proc/sys/vm/swappiness

# To set the swappiness value permanently, edit a sysctl configuration file 
/etc/sysctl.d/99-sysctl.conf

vm.swappiness=10

# WPA
/run/wpa_supplicant/wlp2s0