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Top Forums Shell Programming and Scripting Removing a block of duplicate lines from a file Post 302743711 by pamu on Thursday 13th of December 2012 06:50:28 AM
Old 12-13-2012
Quote:
Originally Posted by raosr020
From lines 1 to 6 ; got repeated twice. That should be kept as it is.

Code:
1 abc
2 123
3 ;
4 rao
5 bell
6 ;
7 call

Is there any special condition for ";"..? Please explain..

Code:
awk '!X[$2]++ || $2 ~ ";"' file
1  abc
2  123
3  ;
4  rao
5  bell
6  ;
7  call
10 ;
13 ;

And if you want to keep first two occurrences of ";" then use..

Code:
awk '!X[$2]++ || ( $2 ~ ";" && ++a < 2 )' file

1  abc
2  123
3  ;
4  rao
5  bell
6  ;
7  call


Last edited by pamu; 12-13-2012 at 08:50 AM.. Reason: added more info
 

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NAMESPACE(6)							   Games Manual 						      NAMESPACE(6)

NAME
namespace - name space description file DESCRIPTION
Namespace files describe how to construct a name space from scratch, an operation normally performed by the newns subroutine (see auth(2)) which is typically called by init(8). Each line specifies one name space operation. Spaces and tabs separate arguments to operations; no quotes or escapes are recognized. Blank lines and lines with # as the first non-space character are ignored. Environment variables of the form $name are expanded within arguments, where name is a UTF string terminated by white space, a /, or a $. The known operations and their arguments are: mount [-abc] servename old [spec] Mount servename on old. bind [-abc] new old Bind new on old. import [-abc] host "[remotepath]mountpoint Import remotepath from machine server and attach it to mountpoint. cd dir Change the working directory to dir. The options for bind, mount, and import are interpreted as in bind(1) and import(4). SEE ALSO
bind(1), namespace(4), init(8) NAMESPACE(6)
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