Ibrahim,
On Sat, 13 Jun 1998, Ibrahim F Haddad wrote:
> Given a file that contains data of the following format:
> 7.606565 5.404950
> 4.969272 4.597600
> 4.969272 4.597600
> 2.400000 3.486746
> 3.000000 3.672252
> 3.600000 3.766663
> How to sort it in increasing order of the x column so
> after sorting it looks like that:
> 2.400000 3.486746
> 3.000000 3.672252
> 3.600000 3.766663
> 4.969272 4.597600
> 4.969272 4.597600
> 7.606565 5.404950
> please note that duplicate entries may exist.
qsort(3) does what you need. You control the behavior of qsort by
passing to it a pointer to a comparison function. The Libc info pages
contain a qsort(3) example.
-Walid
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Walid Keirouz Computer Science---Byblos Campus
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