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Help with sed/awk for reverse search and print

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Top Forums Shell Programming and Scripting Help with sed/awk for reverse search and print
# 8  
Old 02-12-2011
Hi Yinyuemi,

Can you explain
Code:
awk '/\(/  {print "START"$0RT}' RS="START|O)"

so that I can modify it according to my real need.

---------- Post updated at 11:28 PM ---------- Previous update was at 10:47 PM ----------

well with some extra brackets it doesn't work.. closer example is..
Code:
START: ABDCJ
DSH
SDS(dfkhd)
END

START: jsdhjhjshgsj
gjdhi(dkfjd)
kjhg
END (VIO)

START: hshgsh
jfdjjd(fkhfuf)
dkfhdk(vjhfj)
END

START: jhdjghsj
AHDA(vjfkj)
FDJVsss
jdfjd
END (VIO)

START: DSKDJ
DFKDF
BVV(klfdjk)
END

START: kdfhf
djfhdj
kvh(gfjgkfj)
END

sfjhsdj
jhfdj(kfjgk)

---------- Post updated 02-12-11 at 01:47 AM ---------- Previous update was 02-11-11 at 11:28 PM ----------

Quote:
Originally Posted by kurumi
Code:
 $ ruby -0777 -ne '$_.split("END (VIO)").each {|x| puts x.split("START")[-1]}' file

doesn't work....
Last edited by Scott; 02-12-2011 at 06:08 AM.. Reason: Please use code tags
# 9  
Old 02-12-2011
Code:
awk '/\(V/ {print "START"$0RT}' RS="START|IO)"
START: jsdhjhjshgsj
gjdhi(dkfjd)
kjhg
END (VIO)
START: jhdjghsj
AHDA(vjfkj)
FDJVsss
jdfjd
END (VIO)

# 10  
Old 02-13-2011
Thanks, It worked. Can you do me favor by explaining the code.
# 11  
Old 02-13-2011
RS = "START|IO)" : using "START" or "IO)" as the record separator vairiable

RT is the value of RS.
Code:
/\(V/

: match "(V", here, it can also use "END (V" as a match pattern, which was used to specificlly print the content from "START" to "END (VIO)".

I'm not very good at english, so hopelly it can give you some clues.Smilie
This User Gave Thanks to yinyuemi For This Post:
Aia
# 12  
Old 02-13-2011
Thanks. It works for some 8k lines.. but it is not working for lines below 8k in a file.
# 13  
Old 02-13-2011
if the size of your file is not too large,try this:

Code:
tac |awk '/END \(VIO\)/,/START/' |tac

# 14  
Old 02-14-2011
file is big in the range of 16MB.. Is there any option so that
awk '/\(V/ {print "START"$0RT}' RS="START|IO)"

work for bigger file. It works only for few lines. Rest of the file remains untouched.
Last edited by pgbuddy; 02-14-2011 at 10:20 PM..
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