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Removing a block of duplicate lines from a file

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# 1  
Old 12-13-2012
Removing a block of duplicate lines from a file
Hi all,

I have a file with the data

Code:
1  abc
2  123
3  ;
4  rao
5  bell
6  ;
7  call
8  abc
9  123
10 ;
11 rao
12 bell
13 ;

I want remove the lines from 8 to 13 which are the repetion of the lines 1 to 6.

When i use the below command, one of semicolon (Smilie in the first 6 lines is also getting deleted which shouldn't.

Code:
sort myfile | uniq

But I need an ouput as
Code:
 
abc
2 123
3 ;
4 rao
5 bell
6 ;
7 call

Please help me with this..

Thanks alot!!

Regards,
Sreenivas
# 2  
Old 12-13-2012
I don't understand the requirements. Do you want to remove all lines from a file that duplicate the contents of field 2 of the first six lines of your input file? Why do we need to remove field 1 of the first line in the file, but keep field 1 in the other six lines that are kept? Since field 2 in the third line in the file is a duplicate of field 2 in the sixth, tenth, and thirteenth lines of the input file, why shouldn't they all be removed?
# 3  
Old 12-13-2012
Hi Don,

Sorry for the confusion.

Field 1 refers the line numbers. I just kept those for referring lines. Please treat that only field 2 is there in the actual file.

I want to remove a block of lines from 8 to 13, which are the duplicate of the lines 1 to 6.

From lines 1 to 6 ; got repeated twice. That should be kept as it is.

Finally my output should look like:

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

# 4  
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
# 5  
Old 12-13-2012
If you just want to remove line 8 to 13 then you can try this

Code:
sed '8,13d' filename

# 6  
Old 12-13-2012
The requirements still aren't clear.

Are you always only concerned about matching the first six lines, or are you trying to find the first set of n ilnes that are duplicated later in the file?

If the chosen lines at the start of the file are duplicated multiple times, do you only want to remove the first set of duplicated lines or do you want to remove every set of duplicated lines?
# 7  
Old 12-13-2012
try:
Code:
awk '{sub("^[0-9]* *",""); b=b $0 " "} /;/ {for (i in a) sub(a[i],"",b); a[b]=b;
if (b) { i=split(b,o); for (j=1; j<=i; j++) print ++c, o[j]; }
}' infile

Last edited by rdrtx1; 12-13-2012 at 12:11 PM..
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