delete_previous_word
Synopsis:
bind <key>
Description:
This function deletes text on the input line from the position of the cursor
backward to the beginning of the first word found. If is it in the middle of
a word, the beginning of that word is chopped. If it is on whitespace, all text
and whitespace to the beginning of the previous word are deleted.
See Also:
bind
delete_next_word
delete_to_previous_space