<wib_jonas> `` perl -pi -e \'s/^(url\\(1hackeso\\) -) .*/$1 print URL for a file in the hackenv hg repository and web access of the repository/; print\' share/whatis

`4 <cmd> is equivalent to `5 <cmd>, except that it only repeats 4 times. Useful when you've already run a command forgetting to use `5.