Update cheatsheets

linux/cmus

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cmus
+
+> Command-line Music Player.
+> Use arrow keys to navigate, `<enter/return>` to select, and numbers 1-8 switch between different views.
+> More information: <https://cmus.github.io>.
+
+- Open cmus into the specified directory (this will become your new working directory):
+
+`cmus {{path/to/directory}}`
+
+- Add file/directory to library:
+
+`:add {{path/to/file_or_directory}}`
+
+- Pause/unpause current song:
+
+`c`
+
+- Toggle shuffle mode on/off:
+
+`s`
+
+- Quit cmus:
+
+`q`