Prints out all the c++ tokens (keying off ::) in a file

print-cpp-tokens

#!/bin/bash
[ -f "${1}" ] || { echo "Usage: ${0} <file>" >&2; return 1; }
cat "${1}" \
| sed -e 's|//.*$||g' \
| sed -e 's/::/xxDOUBLExCOLONxx/g' \
| perl -ne '{ print join("\n",split(/[[:^word:]]+/)),"\n"; }' \
| sed -e 's/xxDOUBLExCOLONxx/::/g' \
| grep '::' \
| grep -v '^::' \
| sort -u