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Remove double lines in a file (grep, sed ...)

Posted on 2001-07-19
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Last Modified: 2007-12-19
Using the grep command, how can I do to suppress the double lines in a input file.
Thanks for your answers.
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Question by:kindelberger
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by:ahoffmann
ID: 6297777
uniq inputfile
# or if it the double lines are not following each other
sort inputfile|uniq
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by:kindelberger
ID: 6298100
Thanks for your help, but the lines are not following each other and I can not use the sort command because I need to keep the existing order of the lines.
Is there another solution for my  problem ?
Thanks.
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gcauthon earned 100 total points
ID: 6298168
use the nl command too like so:

cat testfile |nl |sort +1 |uniq -s 6 |sort +0n |sed 's/^[    0-9]*//'

by the way, the pattern for sed contains a space and a tab to remove the number introduced by nl.  The line numbers basically keep the original ordering so that the lines can be sorted and uniq'd and then rearranged back the way they were.
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