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Top Forums Shell Programming and Scripting Remove lines with duplicate pairs where AB is equal to BA Post 302922658 by sammy777 on Monday 27th of October 2014 01:35:42 PM
Old 10-27-2014
Remove lines with duplicate pairs where AB is equal to BA

I have a file with four columns like

Code:
dmn10003t1 PF00001 PF00022 dmn12390t1
dmn10008t1 PF00069 PF00027 dmn9781t1
dmn10008t1 PF00068 PF00027 dmn9781t1
dmn10008t1 PF00069 PF00069 dmn9781t1
dmn12390t1 PF00069 PF00076 dmn10003t1

I want to create a new file by comparing the repeated word pairs in column 1 and column 4. The final file will look like

Code:
dmn10003t1 PF00001 PF00022 dmn12390t1
dmn10008t1 PF00069 PF00027 dmn9781t1

There is no specific role of column 2 and column 3 here. In the query file in line 1 pair is dmn10003t1 dmn12390t1 and in line 5 the pair is dmn12390t1 dmn10003t1 which is equivalent as my condition is keep only one occurance if AB is equal to BA, means in such case only one one occurance should be in output file as here will be only line 1 not the line 5.


awk '!seen[$1,$4]++' file does not worked here.
 

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fmt(1)							      General Commands Manual							    fmt(1)

NAME
fmt - format text SYNOPSIS
width] [file...] DESCRIPTION
The command is a simple text formatter that fills and joins lines to produce output lines of (up to) the number of characters specified in the width option. The default width is 72. concatenates the arguments. If none are given, formats text from the standard input. Blank lines are preserved in the output, as is the spacing between words. does not fill lines beginning with a period for compatibility with Nor does it fill lines starting with Indentation is preserved in the output and input lines with differing indentation are not joined (unless is used). can also be used as an in-line text filter for the command: reformats the text between the cursor location and the end of the paragraph. Options recognizes the following options: Crown margin mode. Preserve the indentation of the first two lines within a paragraph and align the left margin of each subsequent line with that of the second line. This is useful for tagged paragraphs. Split lines only. Do not join short lines to form longer ones. This prevents sample lines of code, and other such "formatted" text, from being unduly combined. Fill output lines to up to width columns. WARNINGS
The width option is acceptable for BSD compatibility, but it may go away in future releases. SEE ALSO
nroff(1), vi(1). fmt(1)
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