Example: Ghost File.txt -> ghost_file.txt
slugify -n * # dry run on all files of current directory
slugify -n "Ghost File.txt" # test filenames that don't exist
slugify *.txt
alias slug="slugify -xca $@"
slugify -i # Case -> case
slugify -u # underscore -> space
slugify -t # dash -> space
slugify -d # space -> dash
slugify -c # space space ... -> space