hash command in Linux with examples

hash command in Linux system is the built-in command of bash which is used to maintain a hash table of recently executed programs. It remembers and shows the program locations. It will give the full pathname of each command name.

Syntax:

hash [-lr] [-p pathname] [-dt] [name ...]

Options:

• -d: This is used to forget the remembered location of each NAME.
• -l: It will display in a format that may be reused as input.
• -p: pathname use PATHNAME as the full pathname of NAME.
• -r: Forget all remembered locations.
• -t: To display the remembered location of each NAME, preceding each location with the corresponding NAME if multiple NAMEs are given.

Example 1: hash command without any option

hash

Example 2: hash command with -r option

Example 3: hash command with -l command

hash -l

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