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  • If this was already asked, please point me toward the question it is duplicating. It is very hard to search for character sequences like !#. Commented Apr 27, 2016 at 13:09
  • Did you try it? It just repeats everything you have typed on the current command line. e.g echo !# executes ` echo echo` Commented Apr 27, 2016 at 13:20
  • 2
    For example, if you start a command with 'ls' then follow with ' !#', the command would read 'ls ls'. Something more useful would be modifying a copy of the current line's last argument, a long filename maybe. 'cp longname !#:$' would expand to 'cp longname longname'. Use your bind key sequence (esc-ctrl-e by default I think?) for history expansion to "expand" the !#. Commented Apr 27, 2016 at 13:21
  • In the related posts is an excellent example: unix.stackexchange.com/questions/236382/… Commented Apr 27, 2016 at 13:23