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hints/Shell.md

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+# Unix Shell
+
+## Manuals you'd need
+
+### Testing
+
+If you want to test a string, value or a path, you can use `[`
+
+E.g.
+
+`[ 1 = 1 ]` will return 0, which means true
+
+### Getting Values from CLI
+
+Usually, `$#` means number of arguments, while `$1`, `$2` ... returns the argument.
+
+Special cases:
+
+1. `$@` returns all arguments
+2. `$0` returns the program itself
+
+> Pro tip: there are multiple ways to do this :)
+