Write ~/is-there.sh. It takes one path.

• With no argument: write usage: is-there.sh PATH and end with exit code 2.
• If the path is a file: write file.
• If the path is a directory: write directory.
• Else: write missing and end with exit code 1.

Use [ $# -eq 0 ], [ -f "$1" ] and [ -d "$1" ], with if, elif and else.