Update cheatsheets

tldr/linux/pikman

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pikman
+
+> PikaOS package manager utility.
+> More information: <https://wiki.pika-os.com/en/custom-utils-wiki/pikman-manager-cli>.
+
+- Install a package:
+
+`pikman {{[i|install]}} {{package}}`
+
+- List installed packages:
+
+`pikman {{[l|list]}}`
+
+- Search for a package:
+
+`pikman {{[s|search]}} {{package}}`
+
+- Update the list of available packages:
+
+`pikman update`
+
+- Remove a package:
+
+`pikman {{[r|remove]}} {{package}}`
+
+- Remove all unused packages:
+
+`pikman autoremove`
+
+- List available package updates:
+
+`pikman upgrades`
+
+- Install available package updates:
+
+`pikman upgrade`

tldr/linux/unrtf

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# unrtf
+
+> Convert RTF files to other file formats.
+> More information: <https://manned.org/unrtf>.
+
+- Convert an RTF file to HTML (default):
+
+`unrtf {{path/to/file.rtf}}`
+
+- Convert an RTF file to plain ASCII:
+
+`unrtf --text {{path/to/file.rtf}}`
+
+- Convert an RTF file to LaTeX:
+
+`unrtf --latex {{path/to/file.rtf}}`