in reply to add perl path to INC in my shell script

perl -Idir ...

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perl -Mlib=dir ...

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PERL5LIB=dir"${PERL5LIB:+:$PERL5LIB}" perl ...
PERL5LIB=dir"${PERL5LIB:+:$PERL5LIB}" script.pl ...

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export PERL5LIB=dir"${PERL5LIB:+:$PERL5LIB}"
perl ...
script.pl ...

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Reference: perlrun, lib

In Section Seekers of Perl Wisdom