Update cheatsheets

linux/cgroups

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cgroups
+
+> Cgroups aka control groups is a Linux kernel feature for limiting, measuring, and controlling resource usage by processes.
+> Cgroups however is not a command, but rather a collection of commands, see the relevant pages below.
+> More information: <https://www.kernel.org/doc/Documentation/cgroup-v2.txt>.
+
+- View documentation for `cgclassify`:
+
+`tldr cgclassify`
+
+- View documentation for `cgcreate`:
+
+`tldr cgcreate`
+
+- View documentation for `cgexec`:
+
+`tldr cgexec`