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Top Forums UNIX for Dummies Questions & Answers How to delete or remove duplicate lines in a file Post 302335536 by reva on Monday 20th of July 2009 01:30:43 AM
Old 07-20-2009
Question How to delete or remove duplicate lines in a file

Hi please help me how to remove duplicate lines in any file.
I have a file having huge number of lines.
i want to remove selected lines in it.
And also if there exists duplicate lines, I want to delete the rest & just keep one of them.
Please help me with any unix commands or even fortran program
for example
Code:
 SIG   50   12   0   34   87   3.00  37.0000N  100.0000E
 SIG   50   12   0   34   87   3.00  37.0000N  100.0000E  
SIG   18     7   9     0     0    0.00  36.0000N   60.0000E
SSR   40    7    0    0     0    0.00  35.2000N   60.4000E

Here i want the output to look like
Code:
SIG   50   12   0   34   87   3.00  37.0000N  100.0000E
SIG   18     7   9     0     0    0.00  36.0000N   60.0000E
SSR  40    7    0    0     0    0.00  35.2000N   60.4000E


Last edited by Yogesh Sawant; 07-20-2009 at 07:36 AM.. Reason: added code tags
 

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GIT-STRIPSPACE(1)						    Git Manual							 GIT-STRIPSPACE(1)

NAME
git-stripspace - Remove unnecessary whitespace SYNOPSIS
git stripspace [-s | --strip-comments] < input DESCRIPTION
Clean the input in the manner used by Git for text such as commit messages, notes, tags and branch descriptions. With no arguments, this will: o remove trailing whitespace from all lines o collapse multiple consecutive empty lines into one empty line o remove empty lines from the beginning and end of the input o add a missing to the last line if necessary. In the case where the input consists entirely of whitespace characters, no output will be produced. NOTE: This is intended for cleaning metadata, prefer the --whitespace=fix mode of git-apply(1) for correcting whitespace of patches or files in the repository. OPTIONS
-s, --strip-comments Skip and remove all lines starting with comment character (default #). -c, --comment-lines Prepend comment character and blank to each line. Lines will automatically be terminated with a newline. On empty lines, only the comment character will be prepended. EXAMPLES
Given the following noisy input with $ indicating the end of a line: |A brief introduction $ | $ |$ |A new paragraph$ |# with a commented-out line $ |explaining lots of stuff.$ |$ |# An old paragraph, also commented-out. $ | $ |The end.$ | $ Use git stripspace with no arguments to obtain: |A brief introduction$ |$ |A new paragraph$ |# with a commented-out line$ |explaining lots of stuff.$ |$ |# An old paragraph, also commented-out.$ |$ |The end.$ Use git stripspace --strip-comments to obtain: |A brief introduction$ |$ |A new paragraph$ |explaining lots of stuff.$ |$ |The end.$ GIT
Part of the git(1) suite Git 1.8.3.1 06/10/2014 GIT-STRIPSPACE(1)
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