OP said I have a module that needs to know its path in order to access another file in the same location. -- the second step of File::Basename is to fulfill that requirement (even though he didn't directly ask for it).
Other shell (bash) solutions:
# setup
cd /var/tmp/
touch foo
f='../../var/tmp/foo'
# for just the directory:
d=`(cd ${f%/*} && pwd)`
#or:
d=`dirname $f`
d=`cd $d && pwd`
# for the filename (rel2abs):
d=`dirname $f`
d=`cd $d && pwd`
f=`basename $f`
f=`/bin/ls $d/$f`
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