Enable and disable builtin shell commands.
enable [-n] [-p] [-f filename] [-ads] [name ...]
-a list each builtin with an indication of whether or not it is enabled. -d Delete a builtin loaded with `-f'. -f load the new builtin command name from shared object filename, on systems that support dynamic loading. -n Disable the names listed, otherwise names are enabled. -p Print a list of shell builtins, default if no name arguments appear With no other arguments, the list consists of all enabled shell builtins. -s Restrict to enable only POSIX special builtins
Disabling a builtin allows a disk command which has the same name as a shell builtin to be executed without specifying a full pathname, even though the shell normally searches for builtins before disk commands.
For example, to use the test binary found via $PATH instead of the shell builtin version, type `enable -n test’.
If there are no options, a list of the shell builtins is displayed.
If `-s’ is used with `-f’, the new builtin becomes a special builtin.
The return status is zero unless a name is not a shell builtin or there is an error loading a new builtin from a shared object.