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Replace the line with specific pattern

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# 1  
Old 04-09-2014
Replace the line with specific pattern
Hello All

I'm trying to change one string from a file contening this patern:
xxxx-xxxx

4 numbers - end 4 other numbers
This is a sample of the file:

Code:
LDR  00679 am a2200205   4500
=001  3617
=008  030219s2000\\\\xxx|||||\||||\00|\0\spa\d
=020  \\$a0211-1942
=041  \\$aCastellà
=093  \\$a19/02/2003
=095  \\$a12/11/2001
=100  \\$aGorrotxategi Anieto, Xabier$91930
=245  \\$aArte paleolítico parietal de Bizcaia


as you see there is a line :=020 \\$a0211-1942
So I would like to detect deep in a big file with a lot of records like this. and every row with xxxx-xxxx replace the code =020 by =022

I know that sed can do this but I have no idea how... Some one can help ??

Thanks a lot
Last edited by vbe; 04-09-2014 at 05:37 AM.. Reason: code tags not icode please
# 2  
Old 04-09-2014
Code:
 sed -i.bak 's:=020 \(\\\\$a[0-9]\{4\}-[0-9]\{4\}\):=022 \1:' file

# 3  
Old 04-09-2014
Hi
thanks for this rapid answer... Whooaw
So I guess that the way to grab the xxxx-xxxx patern is:

(\\\\$a[0-9]\{4\}-[0-9]\{4\}\)

The start is parentesis write?
I do not anderstand the \\\\ before $a
Then I anderstand this:
[0-9]\{4\}-[0-9]\{4\
it means.. get numeric numbers length 4... isn't it?

Thanks again

---------- Post updated at 03:50 AM ---------- Previous update was at 03:43 AM ----------

Hello again

and...if I want to check de print before replace?
May this sintaxe ok?
sed -p'\(\\\\$a[0-9]\{4\}-[0-9]\{4\}\) \1:' file


Thanks
# 4  
Old 04-09-2014
Hello,

Following may help you in same.


Code:
awk '{match($0,/.*[0-9][0-9][0-9][0-9]\-[0-9][0-9][0-9][0-9]/); a=substr($0,RSTART+4,RLENGTH); {if(a){print "022" a}}}' check_data_check_rem_check12113

Output will be as follows.

Code:
022 \\$a0211-1942

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
ldiaz2106
# 5  
Old 04-09-2014
Hi

very usefull. Thank you very much !!
Does any one can paste url of a tutorial sed and awk for beginners??
jajaja This tools seem to be very powerfull.

Cheers
# 6  
Old 04-09-2014
Quote:
Originally Posted by ldiaz2106
Hi

very usefull. Thank you very much !!
Does any one can paste url of a tutorial sed and awk for beginners??
jajaja This tools seem to be very powerfull.

Cheers
I advice for this links for you
Famous Sed One-Liners Explained, Part I: File Spacing, Numbering and Text Conversion and Substitution - good coders code, great reuse
Sed - An Introduction and Tutorial

Regards
ygemici
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