ansaurus

Question

Answer 1

+5 A:

grep for foo OR bar OR baz, stolen from ruby1line.txt.

$  ruby -pe 'next unless $_ =~ /(foo|bar|baz)/' < file.txt

eed3si9n 2009-03-11 05:04:46

Answer 2

+1 A:

Well it seems eed3si9n has the one liner down, here's the longer solution:

f = File.new("file.txt")
text = f.read
if text =~ /string/ then
#relevant code
end

John T 2009-03-11 05:12:48

You need to quote your file name.

Ryan Bigg 2009-03-11 05:15:44

yeah just noticed while you posted this

John T 2009-03-11 05:16:43

one-liner: `whatever(x) if File.read("file.txt") =~ /regex/`

rampion 2009-03-11 11:41:15

Answer 3

A:

Cheatng a little by using a system call:

system("grep meow cat_sounds.txt")

Will return true if grep returns anything, false if it does not.

I find this is the "best" way because Ruby is slow when it comes to file operations.

Ryan Bigg 2009-03-11 05:17:21

he hasnt specified his os yet =\

John T 2009-03-11 05:19:29

I think it's best to assume he's sane.

Ryan Bigg 2009-03-11 05:20:23

Funily enough it was a rakefile I was creating when I came up with this question, so I can even re-factor this to sh "grep meow cat_sounds.txt" :-)

ChrisInCambo 2009-03-11 05:36:37

And it still returns true / false? Cool! http://rake.rubyforge.org/classes/FileUtils.html#M000018 haha! The example is even grepping!

Ryan Bigg 2009-03-11 05:41:31

What does sanity have to do with the fact that not all OSes have a "grep" command?

bk1e 2009-03-11 05:53:20

I find it insane that people try to run Ruby on Windows, given all the pitfalls.

Ryan Bigg 2009-03-11 06:00:26

Ruby works on Windows quite well actually. But then you have the gems....*grimace of pain*. Still, it's my language of choice for system scripts.

SimonV 2009-03-11 16:50:16

Answer 4

A:

open('some.txt').grep(/string/)

AdamK 2009-03-12 04:40:09

What's the best way to search for a string in a file?