Hello Alexander-36725,   You would use 'no shutdown' to enable the port Page 461 The following example reenables Gigabit Ethernet port 1/0/5. console(config)#interface gigabitethernet 1/0/5 console(config-if-Gi1/0/5)# no shutdown   [URL]  
I want to be able to disable/enable ports via terminal.(on eg N1548 switches). I found this for disabling ports[URL] Works fine:) But i cant see any command there that would enable the port again:)There is no corresponding cmd to enable a port, like "shutdown" disables a port.
enable switch interface port