Update cheatsheets

tldr/linux/systemctl-list-sockets

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl list-sockets
+
+> List active socket units currently in memory, ordered by listening address.
+> See also: `systemctl list-units`, `systemctl list-unit-files`.
+> More information: <https://www.freedesktop.org/software/systemd/man/systemctl.html#list-sockets%20PATTERN%E2%80%A6>.
+
+- List active socket units currently in memory:
+
+`systemctl list-sockets`
+
+- List active socket units with their socket types:
+
+`systemctl list-sockets --show-types`
+
+- List all socket units, including inactive and failed ones:
+
+`systemctl list-sockets {{[-a|--all]}}`
+
+- List socket units filtered by state:
+
+`systemctl list-sockets --state {{active|inactive|failed|...}}`
+
+- List socket units matching a name pattern:
+
+`systemctl list-sockets {{pattern1 pattern2 ...}}`