Update cheatsheets

tldr/linux/systemctl-preset

@@ -0,0 +1,26 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl preset
+
+> Reset the enablement state of unit files to the defaults specified in preset policy files.
+> See also: `systemctl preset-all`, `systemctl list-unit-files`.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemctl.html#preset%20UNIT%E2%80%A6>.
+
+- Reset the enablement state to preset defaults:
+
+`systemctl preset {{unit1 unit2 ...}}`
+
+- Enable only if marked as enabled in the preset policy:
+
+`systemctl preset {{unit}} --preset-mode enable-only`
+
+- Disable only if marked as disabled in the preset policy:
+
+`systemctl preset {{unit}} --preset-mode disable-only`
+
+- Suppress output and return only the exit code:
+
+`systemctl preset {{unit}} {{[-q|--quiet]}}`