Demo of filename parsing in Bash

bash-filenames.sh

#!/bin/bash

echo "\${0} = ${0}"
echo "dirname \${0} = `dirname ${0}`"
echo "basename \${0} = `basename ${0}`"
echo "readlink -m \${0} = `readlink -m ${0}`" #In BSD (maybe not with -m option, though)
echo "realpath -m \${0} = `realpath -m ${0}`" #Easy to remember
echo "\$(cd \$(dirname \${0}); pwd)/\$(basename ${0}) = $(cd $(dirname ${0}); pwd)/$(basename ${0})" #Should be truly cross-platform
echo "\${0/%.sh/.foo} = ${0/%.sh/.foo}"