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selfh.st: Command Corner There are some extremely useful commands here, & I just wanted to have them noted down somewhere. tr -dc A-Za-z0-9_ < /dev/urandom | head -c 16 | xargs Use tr -dc A-Za-z0-9_ < /dev/urandom | head -c 16 | xargs to quickly generate a password from the command line (create a bash alias for quick reference in the future): $ tr -dc A-Za-z0-9_ < /dev/urandom | head -c 16 | xargs nfZY12B8v9ppdayQ ls | wc -l Use ls | wc -l to quickly count the number of files & folders in the current directory: $ ls | wc -l 8 for i in *; do test -d $i && du -sh $i; done ` Use for i in *; do test -d $i && du -sh $i; done to output a list of directories in the current folder and their sizes (skipping files and subdirectories): ...