Windows

• Disable Win Connection Test: regedit HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/services/NlaSvc/Parameters/Internet/EnableActiveProbing [Source]

Linux

• VI: %s/foo/bar/g to replace all occurrences of the word foo in the current file with the word bar
• Generate random password: < /dev/urandom tr -dc A-Z-a-z-0-9 | head -c${1:-8};echo;
• List classes in classpath: for i in *.jar; do echo $i; unzip -t $i; done | less

Raspbian

• Download & burn image: curl https://downloads.raspberrypi.org/raspios_lite_armhf/images/raspios_lite_armhf-2020-12-04/2020-12-02-raspios-buster-armhf-lite.zip | zcat | sudo dd of=/dev/mmcblk0 bs=4M conv=fsync