Update cheatsheets

tldr/linux/systemctl-show

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systemctl show
+
+> Show properties of units or systemd itself.
+> More information: <https://www.freedesktop.org/software/systemd/man/systemctl.html#show%20PATTERN%E2%80%A6%7CJOB%E2%80%A6>.
+
+- Show properties of the system service manager:
+
+`systemctl show`
+
+- Show properties of the user service manager:
+
+`systemctl show --user`
+
+- Show properties of a specific unit:
+
+`systemctl show {{unit}}`
+
+- Show properties of a specific user unit:
+
+`systemctl show --user {{unit}}`
+
+- Include empty properties in the list:
+
+`systemctl show {{[-a|--all]}}`
+
+- Only show the specified properties:
+
+`systemctl show {{[-p|--property]}} {{Wants,Conflicts,...}} {{unit}}`