The shift without an argument defaults to @_.

except in main scope (outside a sub) where shift operates on @ARGV by default. Consider:

perl -e "print shift" wibble

[download]

Prints:

wibble

[download]
Perl is environmentally friendly - it saves trees

In reply to Re^2: Using 'Shift' in subroutine argument by GrandFather
in thread Using 'Shift' in subroutine argument by Anonymous Monk

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