Tutorial on using du, a UNIX and Linux command for estimating file space usage. Examples of showing a disk usage summary, outputting a human readable format, showing the size of a directory and showing the ten largest files or folders on a system.
Tutorial on using sha1sum, a UNIX and Linux command to compute and check a SHA-1 message digest. Examples of reading a SHA-1 message digest, writing a SHA-1 message digest to a file, and checking a SHA-1 message digest.
Tutorial on using pwd, a UNIX and Linux command for printing the name of the current working directory. Examples of printing the current working directory, avoiding symlinks and how to get the current working directory in shell scripts.