Update cheatsheets

linux/xclock

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xclock
+
+> Display the time in analog or digital form.
+> More information: <https://manned.org/xclock>.
+
+- Display an analog clock:
+
+`xclock`
+
+- Display a 24-hour digital clock with the hour and minute fields only:
+
+`xclock -digital -brief`
+
+- Display a digital clock using an strftime format string (see strftime(3)):
+
+`xclock -digital -strftime {{format}}`
+
+- Display a 24-hour digital clock with the hour, minute and second fields that updates every second:
+
+`xclock -digital -strftime '%H:%M:%S' -update 1`
+
+- Display a 12-hour digital clock with the hour and minute fields only:
+
+`xclock -digital -twelve -brief`