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Command to remove duplicate lines with perl,sed,awk

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# 1  
Old 10-15-2010
Command to remove duplicate lines with perl,sed,awk
Input:
Code:
hello hello
hello hello
monkey
donkey
hello hello
drink
dance
drink

Output should be:
Code:
hello hello
monkey
donkey
drink
dance

# 2  
Old 10-15-2010
Hi.

I'm sure we must have gone over this Smilie

Code:
awk '!_[$0]++' file

# 3  
Old 10-15-2010
Code:
$ ruby -00 -ne 'puts $_.split("\n").uniq' file
hello hello
monkey
donkey
drink
dance

# 4  
Old 10-16-2010
Anybody knows the solution with sed,perl?
# 5  
Old 10-16-2010
Code:
perl -ne 'print unless $a{$_}++' file

These 2 Users Gave Thanks to bartus11 For This Post:
cola R3353
# 6  
Old 10-16-2010
Quote:
Originally Posted by bartus11
Code:
perl -ne 'print unless $a{$_}++' file

Nice.
# 7  
Old 10-16-2010
Quote:
Anybody knows the solution with sed
There is no general solution for sed unless the file is sorted. If sorted, the following deletes the duplicate lines:
Quote:
sed '$!N; /^\(.*\)\n\1$/!P; D'
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