ls # list dir / files ls -lah | more # list all files in list / human readable format ls -d # list directories only ls -lR # list files / dir in list format recursively ls -lahRG # list all files / dirs, list format, recursively, with colour format (if colours not already set in environment variables) ls -lah | sort -bn +4 # list files by size smallest to largest ls -lah | sort -bnr +4 # list files by size largest to smallest ls -lahG *.txt # list only .txt files (with other options mentioned above)