Shell Programming and Scripting

Might I'm late but with awk

Code:

 awk  ' length > 20 {$0=substr($0,0,20); } 1' filename

Thanks for the response.. "Sed" is working fine. I this this awk didn't work...
Anyways can you please explain me the above "awk" command ? I appreciate your help.

Thanks
Kind Regards
VPadala

1. length > 20 -- checks line length
2. $0=substr($0,0,20) -- if step1 is true then do this action
set line to first 20 characters
3. Print the complete line.

withdrawn

@tarun - you need to read the full question

this awk will work for you.

Code:

 
awk 'length($0)==35{$0=substr($0,0,21)substr($0,24,35)}1' input.txt

Thank you. I really appreciate your help.This make sense.could you please tell me what does "1" doing here.

Thanks
VPadala

Hi,

please find..


Everything in awk has the form condition{action} . If the condition evaluates to 1 then the action is performed. If the condition is omitted then the default condition is 1, so the action is always performed. If the action is omitted then the default action is performed, which is {print $0} . In this case the condition is "1" so that evaluates to 1 and the action is omitted, therefore {print $0 } is performed, which is "print the entire record".