in reply to what does $subdir = "$BASEDIR/$subdir" unless $subdir =~ m{^/}; do

$subdir =~ m{^/};

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returns a true value if $subdir starts with a '/'.

So the whole statement leaves $subdir as it is, if it already is an absolute path (starting with /) or it prepends a $BASEDIR and stores the result in $subdir again.

Cheers, Flo

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