Update cheatsheets

tldr/linux/eselect-repository

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# eselect repository
+
+> An `eselect` module for configuring ebuild repositories for Portage.
+> After enabling a repository, you have to run `emerge --sync repo_name` to download ebuilds.
+> More information: <https://wiki.gentoo.org/wiki/Eselect/Repository>.
+
+- List all ebuild repositories registered on <https://repos.gentoo.org>:
+
+`eselect repository list`
+
+- List enabled repositories:
+
+`eselect repository list -i`
+
+- Enable a repository from the list by its name or index from the `list` command:
+
+`eselect repository enable {{name|index}}`
+
+- Enable an unregistered repository:
+
+`eselect repository add {{name}} {{rsync|git|mercurial|svn|...}} {{sync_uri}}`
+
+- Disable repositories without removing their contents:
+
+`eselect repository disable {{repo1 repo2 ...}}`
+
+- Disable repositories and remove their contents:
+
+`eselect repository remove {{repo1 repo2 ...}}`
+
+- Create a local repository and enable it:
+
+`eselect repository create {{name}} {{path/to/repo}}`