systemctl-list-unit-files: add page

pages/linux/systemctl-list-unit-files.md

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+# systemctl list-unit-files
+
+> List installed unit files and their enablement states.
+> See also: `systemctl list-units` for listing units currently loaded in memory.
+> More information: <https://www.freedesktop.org/software/systemd/man/latest/systemctl.html#list-unit-files%20PATTERN%E2%80%A6>.
+
+- List installed unit files and their states:
+
+`systemctl list-unit-files`
+
+- Filter by state:
+
+`systemctl list-unit-files --state {{enabled|disabled|static|...}}`
+
+- Filter by unit type:
+
+`systemctl list-unit-files {{[-t|--type]}} {{service|socket|timer|...}}`
+
+- Filter by a name pattern:
+
+`systemctl list-unit-files '{{sshd*}}'`
+
+- Print output directly to `stdout`:
+
+`systemctl list-unit-files --no-pager`
+
+- Print output without headers or footers:
+
+`systemctl list-unit-files --no-legend`