This seems to be working
 
cat test

1
2
3
4
5

perl -pe 'BEGIN{$prefix=pop;}s/(\d+)/$prefix.$1/' test A

A.1
A.2
A.3
A.4
A.5

[download]

In reply to Re^3: Command-line arguments to command-line Perl by suhailck
in thread Command-line arguments to command-line Perl by RecursionBane

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