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Old 05-26-2010, 11:52 AM   #1
webhope
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awk - gensub first result


Hi,
I have this code:
Code:
block='kernel (hd0,2)/boot/vmlinuz BOOT_IMAGE=linux root=UUID=eab515e9-bc3e-4024-9f01-55fddaa0fb1c  resume=UUID=e12487ff-6d6f-44c4-9e03-33f545b3b798 splash=silent vga=788'
echo "$block" | awk '/.*UUID=/{ x=gensub(/.*UUID=([-0-9a-fA-F]+)[ )].*/,"\\1",1);  print x}'
I need to return the 1st uuid not the second as it did. Where I have a mistake?
Thanks
 
Old 05-26-2010, 07:21 PM   #2
grail
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Read the following - http://www.gnu.org/manual/gawk/html_...ring-Functions
Specifically the sections on sub/gsub/gensub
 
Old 05-27-2010, 02:57 AM   #3
webhope
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Quote:
Originally Posted by grail View Post
Read the following - http://www.gnu.org/manual/gawk/html_...ring-Functions
Specifically the sections on sub/gsub/gensub
I have read about gensub in this manual before I asked this question. I also read about sub and gsub in other awk manual. So where do you want to direct me?

Last edited by webhope; 05-27-2010 at 04:13 AM.
 
Old 05-27-2010, 05:52 AM   #4
grail
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Well I had already directed you, but it appears it did not work. So I will do the work for you:
Quote:
sub(regexp, replacement [, target])
The sub function alters the value of target. It searches this value, which is treated as a string, for the leftmost, longest substring matched by the regular expression regexp.
 
  


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