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ed (Function)

— Function: ed &optional x implementation-dependent
Arguments and Values:

xnil, a pathname, a string, or a function name. The default is nil.


ed invokes the editor if the implementation provides a resident editor.

If x is nil, the editor is entered. If the editor had been previously entered, its prior state is resumed, if possible.

If x is a pathname or string, it is taken as the pathname designator for a file to be edited.

If x is a function name, the text of its definition is edited. The means by which the function text is obtained is implementation-defined.

Exceptional Situations:

The consequences are undefined if the implementation does not provide a resident editor.

Might signal type-error if its argument is supplied but is not a symbol, a pathname, or nil.

If a failure occurs when performing some operation on the file system while attempting to edit a file, an error of type file-error is signaled.

An error of type file-error might be signaled if x is a designator for a wild pathname.

Implementation-dependent additional conditions might be signaled as well.

See Also:

pathname (System Class), logical-pathname (System Class), compile-file, load, Section 19.1.2 (Pathnames as Filenames)