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Deleting text start at 2nd line....

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# 1  
Old 12-20-2012
Deleting text start at 2nd line....
How can I delete the first '2' characters in the 2nd line and every fourth line thereafter (Means line no.s 2, 6, 10...so on).
For example if the following is my Input
Code:
treieieiei
trrpepepepep
tyeueueue
tyeueueeu
tyeyeyeye
tryryry
tyeyey
tyrtyty
tytyty
tututu
tututututu

Output should be:
Code:
treieieiei
..rpepepepep
tyeueueue
tyeueueeu
tyeyeyeye
..yryry
tyeyey
tyrtyty
tytyty
..tutu
tututututu

PS: I have put '..' only to illustrate.
# 2  
Old 12-20-2012
Code:
awk '(NR-2)%4 == 0{$0=substr($0,3)}1' file

Last edited by pamu; 12-20-2012 at 06:15 AM.. Reason: added code...
This User Gave Thanks to pamu For This Post:
cs_novice
# 3  
Old 12-20-2012
Code:
awk -v a=2 'NR==a{sub("^..","");a+=4}1' input.txt

This User Gave Thanks to itkamaraj For This Post:
cs_novice
# 4  
Old 12-20-2012
@pamu: Guess you have got the requirements wrong! Moreover, you don't need to check for (NR-2)%4 and NR==2. The former would do the task! Smilie
# 5  
Old 12-20-2012
Quote:
Originally Posted by PikK45
@pamu: Guess you have got the requirements wrong! Moreover, you don't need to check for (NR-2)%4 and NR==2. The former would do the task! Smilie
No. I got the requirements right..

Please check.

Quote:
Originally Posted by cs_novice
How can I delete the first '2' characters in the 2nd line and every fourth line thereafter (Means line no.s 2, 6, 10...so on).
For example if the following is my Input
PS: I have put '..' only to illustrate.
And for method. Come on man. This is one way of doing and he has another way of doing.
It's up to you which method you want to choose.Smilie
# 6  
Old 12-20-2012
Cool down Smilie Smilie

I got it wrong. I just looked at the IP & OP and came to a wrong conclusion. You rock with "awk" Smilie Smilie

however, the NR==2 is not required in your method :P
# 7  
Old 12-20-2012
Quote:
Originally Posted by PikK45
however, the NR==2 is not required in your method :P
Just tried with the your suggestion. modified in my previous code.

ThanksSmilie

pamu
Last edited by pamu; 12-20-2012 at 06:14 AM..
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