The whence Command The whence command is used to display information about a command, like if it is an alias, built-in Korn shell command, function, reserved Korn shell word, or just a normal Unix command. The format for the whence command is: whence name or whence v name where name is the command or whatever you want to get information about. Here, the whence command shows that history is set to fc l: $ whence history fc l The v option causes more information to be provided about the command. Now we see that history is an exported alias: $ whence v history history is an exported alias for fc l and until is a keyword: $ whence v until until is a keyword For compatibility with the Bourne shell, a preset alias type is set to whence v. $ type md md is an exported function | 
