nc: Remote port check on remote host in Linux

nc (NetCat)

# nc -w [TIMEOUT_SEC] -v [HOST] [PORT] </dev/null; echo $?

or

Just check the HOST's PORT opened

# nc -vz [HOST] [PORT]

Result examples on RHEL 6

Success:

Connection to [HOST] [PORT] port [PROTOCOL] succeeded!

0

Failure:

nc: connect to [HOST] port [PORT] ([PROTOCOL]) timed out: Operation now in progress

1

RHEL 6 (nc):

# yum install nc

RHEL 7 (nmap-ncat):

# yum install nmap-ncat