Unix in a Nutshell, 4th Edition

Name

builtin

Synopsis

    builtin [ -ds ] [ -f library ] [ name ... ]

ksh93 version. This command allows you to load new built-in commands into the shell at runtime from shared library files.

If no arguments are given, builtin prints all the built-in command names. With arguments, builtin adds each name as a new built-in command (like cd or pwd). If the name contains a slash, the newly-added built-in version is used only if a path search would otherwise have found a command of the same name. (This allows replacement of system commands with faster, built-in versions.) Otherwise, the built-in command is always found.

Options

-d

Delete the built-in command name.

-f

Load new built-in command from library.

-s

Only print “special” built-ins (those designated as special by POSIX).