Hi, Not sure how to go about this, say i have file1 with 
aa
aa
aa
ff
ff
dd

[download]
i need to have an additional number column next to this, but the numbers only increment when the row in column one changes. 
aa 1
aa 1
aa 1
ff 2
ff 2
dd 3

[download]
numbering is not dependent on letter in column 1, just alters when change. Thanks

In reply to incrementing a column by Anonymous Monk

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