Update cheatsheets

linux/etckeeper

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# etckeeper
+
+> Track system configuration files in Git.
+> More information: <http://etckeeper.branchable.com/>.
+
+- Set up a Git repo and perform various setup tasks (run from `/etc`):
+
+`sudo etckeeper init`
+
+- Commit all changes in `/etc`:
+
+`sudo etckeeper commit {{message}}`
+
+- Run arbitrary Git commands:
+
+`sudo etckeeper vcs {{status}}`
+
+- Check if there are uncommitted changes (only returns an exit code):
+
+`sudo etckeeper unclean`
+
+- Destroy existing repo and stop tracking changes:
+
+`sudo etckeeper uninit`