I'm a big fan of ack, I love the --output feature, which is super handy. Unfortunately it is hardly ever installed when I need it. It's considerably slower than the highly tuned GNU regex code, which only really matters when you're grepping through a ton of material.
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I found out about ack awhile back -- it's like grep on steroids.
I'm a big fan of ack, I love the --output feature, which is super handy. Unfortunately it is hardly ever installed when I need it. It's considerably slower than the highly tuned GNU regex code, which only really matters when you're grepping through a ton of material.
Could you give an example of something useful one could do with ack's --output feature?
The manual's a little light on the details.
All it says is:
What expression are they talking about? A regular expression? If so, how is that different from a normal grep?A Perl expression. You could use this for sed-like activities:
You could presumably do much trickier things as well, since the --output argument can contain any Perl expression.That's a great example. I just replaced it as the example in the Top 10 List on the front of betterthangrep.com. Thanks.
On Ubuntu, the package name is ack-grep. So use: sudo -i aptitude install ack-grep
Don't go for ack, which is some Kanji character converter.