Hacker News Reader

Comment by soren_dahl | Hacker News Reader

FWIW if you use Bash shell you can also use history expansion to shorten the mkdir && cd line further (the line already includes tilde expansion):

  mkdir ~/www/example.com && cd !$

!$ is the last argument of the preceding command

View on HN

You mean "$_". !$ refers to the previous command in the history.

Fairly sure I meant !$ :)

http://www.gnu.org/software/bash/manual/bashref.html#Word-De...

Seriously, try it. History expansion works on input lines separated by the user asking the shell to run them, it can't cross reference command arguments on the same command line.

I have tried both, the difference is only that !$ echos the expanded command, while $_ simply runs the expanded command; both create a directory and cd into it.

(I'm running OS X, FWIW)

You are correct, so have an upvote.

&& in OS X seems to put the left side into history and works as I described, but it didn't work when I tried it in Ubuntu 10. $_ works in both.

!! refers to the previous command in the history. !$ refers to the last cmd-line option in the history.

I know that, the bit I want to emphasize is that it won't be the mkdir argument that is on the same line.

    mkcd() { mkdir "$1" && cd "$1" }

Reply on news.ycombinator.com