Tests TCP connections by opening a TCP socket to the given host:port.

$ npm install -g tcp-connect.js

$ tcp-connect www.apple.com:80
success: www.apple.com:80

$ tcp-connect www.apple.com:80 8.8.8.8:53 192.0.2.0:65535 unknown.example.com:80
success: www.apple.com:80
success: 8.8.8.8:53
failure: unknown.example.com:80 -- Error: getaddrinfo ENOENT
failure: 192.0.2.0:65535 -- Error: connect ETIMEDOUT

$ cat test/example.txt | tcp-connect
failure: localhost:54321 -- Error: connect ECONNREFUSED
ignored: www.google.com:80
success: 8.8.8.8:53
success: www.apple.com:80
failure: unknown.example.com:80 -- Error: getaddrinfo ENOENT
failure: 192.0.2.0:65535 -- Error: connect ETIMEDOUT

$ tcp-connect
www.google.com:80
success: www.google.com:80
www.yahoo.com:80
success: www.yahoo.com:80
^C

$ tcp-connect #www.google.com:80
ignored: www.google.com:80