You can supply the -p and -i flags within the script itself. Given that your offsets are fixed, you might find that substr is better suited. It is important to insert at your offsets working from the right.

$ cat > spw1055482.txt
aaaaaGGGGGG55555
fffffJJJJJJ11111
kkkkkUUUUUU99999
$ head -99 spw1055482.*
aaaaaGGGGGG55555
fffffJJJJJJ11111
kkkkkUUUUUU99999
$ cat > spw1055482
#!/usr/bin/perl -npi.bak   
#
use strict;
use warnings;

for my $offset ( 11, 5 )
{
    substr $_, $offset, 0, q{^};
}
$ perl spw1055482 spw1055482.txt
$ head -99 spw1055482*
==> spw1055482 <==
#!/usr/bin/perl -npi.bak
#
use strict;
use warnings;

for my $offset ( 11, 5 )
{
    substr $_, $offset, 0, q{^};
}

==> spw1055482.txt <==
aaaaa^GGGGGG^55555
fffff^JJJJJJ^11111
kkkkk^UUUUUU^99999

==> spw1055482.txt.bak <==
aaaaaGGGGGG55555
fffffJJJJJJ11111
kkkkkUUUUUU99999
$

[download]

I hope this is helpful.

Cheers,

JohnGG

In reply to Re: Substitution replacement not terminated by johngg
in thread Substitution replacement not terminated by shan_emails

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