Update cheatsheets

linux/xsel

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xsel
+
+> X11 selection and clipboard manipulation tool.
+> More information: <https://manned.org/xsel>.
+
+- Use a command's output as input of the clip[b]oard (equivalent to `Ctrl + C`):
+
+`echo 123 | xsel -ib`
+
+- Use the contents of a file as input of the clipboard:
+
+`cat {{path/to/file}} | xsel -ib`
+
+- Output the clipboard's contents into the terminal (equivalent to `Ctrl + V`):
+
+`xsel -ob`
+
+- Output the clipboard's contents into a file:
+
+`xsel -ob > {{path/to/file}}`
+
+- Clear the clipboard:
+
+`xsel -cb`
+
+- Output the X11 primary selection's contents into the terminal (equivalent to a mouse middle-click):
+
+`xsel -op`