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Remove Duplicate Lines


 
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# 8  
Old 08-21-2013
Quote:
Originally Posted by rdrtx1
try also:
Code:
awk 'a[$0]++ {delete a[$0]} END {for (i in a) print i}' input

That solution doesn't work. If $0 appears an odd number of times, it will be printed.

Regards,
Alister
# 9  
Old 08-23-2013
I have a problem this solution. I don't want sort the text. they are doing it.

input:

Code:
111
222
444
111
333
888
222
666




output:
Code:
444
333
888
666

# 10  
Old 08-24-2013
Not sure if this is the most efficient use of memory:
Code:
awk ' b[$0] {c[$0]++} {a[NR]=$0;b[$0]++} END {for (i=1;i<=NR;i++) if (!(a[i] in c)) print a[i]}' file
444
333
888
666

# 11  
Old 08-24-2013
Code:
awk ' NR==FNR {a[$0]++; next} a[$0]==1' file file


Last edited by MadeInGermany; 08-24-2013 at 05:15 PM..
 

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