Update cheatsheets

fish

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# fish
+
+> The Friendly Interactive SHell, a command-line interpreter designed to be user friendly.
+> More information: <https://fishshell.com>.
+
+- Start an interactive shell session:
+
+`fish`
+
+- Start an interactive shell session without loading startup configs:
+
+`fish --no-config`
+
+- Execute specific commands:
+
+`fish --command "{{echo 'fish is executed'}}"`
+
+- Execute a specific script:
+
+`fish {{path/to/script.fish}}`
+
+- Check a specific script for syntax errors:
+
+`fish --no-execute {{path/to/script.fish}}`
+
+- Execute specific commands from `stdin`:
+
+`{{echo "echo 'fish is executed'"}} | fish`
+
+- Start an interactive shell session in private mode, where the shell does not access old history or save new history:
+
+`fish --private`
+
+- Define and export an environmental variable that persists across shell restarts (builtin):
+
+`set --universal --export {{variable_name}} {{variable_value}}`