From: Rob Biedenharn <Rob@...>
Date: 2010-12-15T23:39:32+09:00
Subject: Re: Grep a string


On Dec 14, 2010, at 6:21 PM, Ryan Davis wrote:

>
> On Dec 14, 2010, at 07:21 , Rob Biedenharn wrote:
>
>> Well, you asked on a Ruby list so you're getting a Ruby answer from  
>> me.
>>
>> crontab -l | ruby -nle 'next if $_ =~ /^\s*#/; fields = $_.split("  
>> ",6); puts fields.inspect;'
>
> Don't forget the -a flag!
>
> % ruby -h | grep -- -a
>  -a              autosplit mode with -n or -p (splits $_ into $F)
>  -Fpattern       split() pattern for autosplit (-a)
>
> so you can do something like:
>
> % ruby -nae 'next unless $_ =~ /^[\d\*]/; p $F'  
> crontab.envy.zenspider.com
> ["*/5", "*", "*", "*", "*", "~/Work/p4/zss/src/scripts/dev/ 
> p4autotest.sh"]
> ["*/5", "*", "*", "*", "*", "~/Work/p4/zss/src/scripts/dev/ 
> p4review.py"]
> ["*/15", "*", "*", "*", "*", "/Volumes/Users/www/zenspider.com/bin/ 
> webupdate.sh"]
> ["0", "*", "*", "*", "*", "(imap_cleanse", "&&", "imap_flag)", "&>",  
> "/dev/null"]
> ["12", "*", "*", "*", "*", "cd", "~/Work/git/synchronizer", "&&",  
> "rake", "-s", "sync"]

Except that I have $_.split(" ", 6) since there are 5 schedule parts  
and 1 command part, I want all the command to be left together as a  
single part.  So my fields[-1] is effectively $F[5..-1]*' ' had I used  
the -a. Good to remind the list of the flag though.

-Rob

Rob Biedenharn		
Rob@AgileConsultingLLC.com	http://AgileConsultingLLC.com/
rab@GaslightSoftware.com		http://GaslightSoftware.com/