perl - remove duplicate lines in a txt document and keep one? -


i not programmer, remove duplicate lines in document , keep original lines. trying text processors, editpadpro, since file more 1 gigabyte, gets frozen , can't complete operation.

i know perl @ this, don't know how use it, keeping in mind file can on 1 or 2 gb.

example of input lines: 

line 1  line 2 line 3 line 1 line 2 line 4 line 1

example of output lines: 

line 1  line 2 line 3 line 4

i sorry if basic, don't know how proceed, of time use built in functions, hope not annoy question.

if don't mind lines not being in original order, can use command:

$ sort -u old_file.txt > new_file.txt

the sort sort file, , -u option stands unique means output first matching line.

even large files, sort may best hope.


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