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add id in the first column
Hi... I have a text file with one column
e.x
10291
10291
2432
23592
3499
......
I want to add a column in the front with an id
ex
1 10291
2 10291
3 2432
4 23592
5 3499
......
How can i do that using command line?
I think that sed may help me
Any suggestion?
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