Help on deleting Duplicate enteries

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Hello people , I am very new to perl , and facing a lil problem trying to get rid of duplicate errors in a file, I have a file as below

att
comcast
mci
comcast
sprint
att
verizon
att
att
att
[download]

every enter is on a new line in the file ... I need to know how to write a script which will get rid of the duplicate enteries and then save the file with the same name in the same location .. can anyone please help me on this Thank you

Comment on Help on deleting Duplicate enteries Download Code

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Re: Help on deleting Duplicate enteries by CombatSquirrel (Hermit) on Aug 26, 2003 at 21:38 UTC
`perl -ni -e 'print unless $seen{$_}++' comps.dat` Cheers, CombatSquirrel. Entropy is the tendency of everything going to hell.	[reply] [d/l]
Re: Re: Help on deleting Duplicate enteries by sweetblood (Prior) on Aug 27, 2003 at 01:22 UTC
all I can say is DAMN ++	[reply]
Re: Help on deleting Duplicate enteries by VSarkiss (Monsignor) on Aug 26, 2003 at 21:42 UTC
If you're on *nix or are using something like Cygwin, you don't even need to write a program. Use the `sort` utility: `sort -u -o file file` [download] substituting for `file` as appropriate. This has the side effect of sorting the file, but you didn't indicate whether that was desirable or not.	[reply] [d/l] [select]
Re: Help on deleting Duplicate enteries by Abigail-II (Bishop) on Aug 26, 2003 at 21:32 UTC
What did you try so far? Have you checked out the FAQ? `perldoc -q duplicate`. Have you searched this site? Abigail	[reply]