source: drbl_ui/backup/test_busybox/busybox-1.7.2/scripts/find_stray_common_vars

#!/bin/sh

# Common variables are elusive, they don't show up in size output!
# This script will show all commons in *.o, sorted by size

find -name '*.o' \
| while read name; do
    b=`basename "$name"`
    nm "$name" | sed "s/^/$b: /"
done | grep -i ' c ' | sort -k2