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find out duplicate records in file?

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# 1  
Old 03-11-2009
find out duplicate records in file?
Dear All,

I have one file which looks like :

account1:passwd1
account2:passwd2
account3:passwd3
account1:passwd4
account5:passwd5
account6:passwd6

you can see there're two records for account1. and is there any shell command which can find out : account1 is the duplicate record in file?

Thanks.
# 2  
Old 03-11-2009
Code:
awk -F":" '{_[$1]++}
END{
  for (i in _)
   print "Duplicated: _[i]
}' filename

# 3  
Old 03-12-2009
i guess there's one missing " in 4th line?
but after appending the " , it still doesn't work...
# 4  
Old 03-12-2009
Quote:
Originally Posted by tiger2000
Dear All,

I have one file which looks like :

account1:passwd1
account2:passwd2
account3:passwd3
account1:passwd4
account5:passwd5
account6:passwd6

you can see there're two records for account1. and is there any shell command which can find out : account1 is the duplicate record in file?

Code:
awk -F: 'x[$1]++ { print $1 " is duplicated"}' FILENAME

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