Update cheatsheets

linux/getopt

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# getopt
+
+> Parse command-line arguments.
+> More information: <https://www.gnu.org/software/libc/manual/html_node/Getopt.html>.
+
+- Parse optional `verbose`/`version` flags with shorthands:
+
+`getopt --options vV --longoptions verbose,version -- --version --verbose`
+
+- Add a `--file` option with a required argument with shorthand `-f`:
+
+`getopt --options f: --longoptions file: -- --file=somefile`
+
+- Add a `--verbose` option with an optional argument with shorthand `-v`, and pass a non-option parameter `arg`:
+
+`getopt --options v:: --longoptions verbose:: -- --verbose arg`
+
+- Accept a `-r` and `--verbose` flag, a `--accept` option with an optional argument and add a `--target` with a required argument option with shorthands:
+
+`getopt --options rv::s::t: --longoptions verbose,source::,target: -- -v --target target`