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It is true that your script will replace the Perl path within the shebang string, but it will also replace it if the same string is anywhere inside the script.
perl -pi.bak -e 's[^#!/usr/local/bin/perl][#!/usr/bin/perl]' *.pl
This one should guarantee that the replacement happens only at the beginning of a string. To ensure that the replacement is carried out only once in each script, though, one more check is needed.
perl -pi.bak -e 'BEGIN{$c=@ARGV};s[^#!/usr/local/bin/perl][#!/usr/bin/ +perl] && $c-- if $c> @ARGV' *.pl
which translates roughly into
#!/usr/bin/perl -w -i.bak use strict our $count=@ARGV; while (<>) { if ($count > @ARGV) { s[^#!/usr/local/bin/perl][#!/usr/bin/perl]; $count--; } print; }

In reply to Re: Re: question about perl by rnahi
in thread How do I change the shebang line for all perl scripts in a directory by Anonymous Monk

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