Update cheatsheets

linux/abbr

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# abbr
+
+> Manage abbreviations for the fish shell.
+> User-defined words are replaced with longer phrases after they are entered.
+> More information: <https://fishshell.com/docs/current/cmds/abbr.html>.
+
+- Add a new abbreviation:
+
+`abbr --add {{abbreviation_name}} {{command}} {{command_arguments}}`
+
+- Rename an existing abbreviation:
+
+`abbr --rename {{old_name}} {{new_name}}`
+
+- Erase an existing abbreviation:
+
+`abbr --erase {{abbreviation_name}}`
+
+- Import the abbreviations defined on another host over SSH:
+
+`ssh {{host_name}} abbr --show | source`