"ls -1 . dir2 dir3|sort|uniq -d
Find files with the same names in several directories.
cat file1 file2 file3|sort|uniq -d
"ssh -CNL 3306:localhost:3306 user@site.com
Create an SSH tunnel for accessing your remote MySQL database with
a local port
ssh -D 8888 user@site.com
"Forward port 8888 to remote machine for SOCKS Proxy
Simply change your web browser's proxy settings to point to a SOCKS
proxy at port 8888 and you're good to go."