Update cheatsheets

linux/utmpdump

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# utmpdump
+
+> Dump and load btmp, utmp and wtmp accounting files.
+> More information: <https://manned.org/utmpdump>.
+
+- Dump the `/var/log/wtmp` file to `stdout` as plain text:
+
+`utmpdump {{/var/log/wtmp}}`
+
+- Load a previously dumped file into `/var/log/wtmp`:
+
+`utmpdump -r {{dumpfile}} > {{/var/log/wtmp}}`