functions - print or erase functions


functions [-a | --all] [-n | --names]
functions [-D | --details] [-v] FUNCTION
functions -c OLDNAME NEWNAME
functions [-e | -q] FUNCTION ...


functions prints or erases functions.

The following options are available:

-a or --all

Lists all functions, even those whose name starts with an underscore.

-c or --copy OLDNAME NEWNAME

Creates a new function named NEWNAME, using the definition of the OLDNAME function.

-d or --description DESCRIPTION

Changes the description of this function.

-e or --erase

Causes the specified functions to be erased. This also means that it is prevented from autoloading in the current session. Use funcsave to remove the saved copy.

-D or --details

Reports the path name where the specified function is defined or could be autoloaded, stdin if the function was defined interactively or on the command line or by reading standard input, - if the function was created via source, and n/a if the function isn’t available. (Functions created via alias will return -, because alias uses source internally.) If the --verbose option is also specified then five lines are written:

  • the pathname as already described,

  • autoloaded, not-autoloaded or n/a,

  • the line number within the file or zero if not applicable,

  • scope-shadowing if the function shadows the vars in the calling function (the normal case if it wasn’t defined with --no-scope-shadowing), else no-scope-shadowing, or n/a if the function isn’t defined,

  • the function description minimally escaped so it is a single line, or n/a if the function isn’t defined or has no description.

You should not assume that only five lines will be written since we may add additional information to the output in the future.


Turns off function path reporting, so just the definition will be printed.

-n or --names

Lists the names of all defined functions.

-q or --query

Tests if the specified functions exist.

-v or --verbose

Make some output more verbose.

-H or --handlers

Show all event handlers.

-t or --handlers-type TYPE

Show all event handlers matching the given TYPE.

-h or --help

Displays help about using this command.

The default behavior of functions, when called with no arguments, is to print the names of all defined functions. Unless the -a option is given, no functions starting with underscores are included in the output.

If any non-option parameters are given, the definition of the specified functions are printed.

Copying a function using -c copies only the body of the function, and does not attach any event notifications from the original function.

Only one function’s description can be changed in a single invocation of functions -d.

The exit status of functions is the number of functions specified in the argument list that do not exist, which can be used in concert with the -q option.


functions -n
# Displays a list of currently-defined functions

functions -c foo bar
# Copies the 'foo' function to a new function called 'bar'

functions -e bar
# Erases the function ``bar``

See more

For more explanation of how functions fit into fish, see Functions.