Update cheatsheets

watch

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# watch
+
+> Execute a program periodically, showing output fullscreen.
+> More information: <https://manned.org/watch>.
+
+- Repeatedly run a command and show the result:
+
+`watch {{command}}`
+
+- Re-run a command every 60 seconds:
+
+`watch -n {{60}} {{command}}`
+
+- Monitor the contents of a directory, highlighting differences as they appear:
+
+`watch -d {{ls -l}}`
+
+- Repeatedly run a pipeline and show the result:
+
+`watch '{{command_1}} | {{command_2}} | {{command_3}}'`