mkdir - make directories

Options you will use

-p, --parents

Create parent directories as needed; no error if the directory already exists.

-m MODE, --mode=MODE

Set the permission bits of the new directory (umask is not applied).

-v, --verbose

Print a message for each created directory.

Examples

$ mkdir -p ~/oncall-lab/labs/1a-linux/{systemd,processes,bash}

brace expansion makes all three in one go

Gotchas

• Brace expansion happens in the SHELL before mkdir runs - it never sees the braces. A relative path here is relative to your CURRENT directory, which is how you end up with a second labs/ folder.

Taught in

• 1.5 Making things
• 1.7 Driving the shell: exit codes, chaining, redirection
• 4.7 r and x mean something else on a directory
• 4.9 setuid, setgid, sticky and umask
• 4.15 find: the expression language
• 9.17 Certificates with openssl, and the JVM truststore
• 11.22 Volumes, bind mounts, tmpfs, and the UID problem
• 21.29 Python for operations: the subset, venv, and why never system pip