2 cool ways to find broken symbolic links on your system:
Bash:
for i in `find /`; do if (test -h $i); then file $i|grep broken; fi; done
Output:
./bar_link: broken symbolic link to `/etc/foo'
Any Shell:
find / -type l ! -exec test -r {} \; -print
Output:
./bar_link
When measuring the results with "time" command - the 2nd command wins, so if performance is critical in your case, use the 2nd one :)
