Enable and disable builtin shell commands.

       enable [-a] [-dnps] [-f filename] [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.

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.


To use the test binary found via $PATH instead of the shell builtin version:

$ enable -n test

“You see things; and you say 'Why?' But I dream things that never were; and I say 'why not?' ~ George Bernard Shaw

Related Linux commands

builtin - Run a shell builtin.
chroot - Run a command with a different root directory.
exec - Execute a command.
nohup - Run a command immune to hangups.
su - Run a command with substitute user and group id.
watch - Execute/display a program periodically.
.source - Run commands from a file.

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