Re^3: Sorting a text file

by Anno (Deacon)

on Mar 15, 2007 at 10:47 UTC ( [id://604957]=note: print w/replies, xml )

Need Help??

You could turn GrandFather's approach around and swap keys and values in the hash:

my %data;
( $data{ $_}) =  /^\d+\s+(\d+)/ while <DATA>;

print for sort { $data{ $a} cmp $data{ $b} } keys %data;
[download]

This is essentially a variant of the Schwartz Transform, using a hash in place of an array to keep the sort field(s).

Anno

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