I use this bash one-liner < /dev/urandom tr -cd "[:print:]" | tr -d '[]<>(),~.\;\: \\/\`\|\{\}\'\"\' | head -c 8; echo Generates 8 random characters exclu

I use this bash one-liner < /dev/urandom tr -cd "[:print:]" | tr -d '[]<>(),~.\;\: \\/\`\|\{\}\'\"\' | head -c 8; echo Generates 8 random characters excluding punctuation that is often not allowed in passwords. You can change `head -c 8` to the desired length of the password. If you get something difficult to type, just generate another one.