Use commands to view port occupancy in Gnu/linux

The first method:

root@debian:/home/# netstat-ant

Active Internet connections (servers and established)

Proto recv-q send-q Local address Foreign

TCP 0 0 127.0.0.1:25 0.0.0.0:* LISTEN

TCP 0 0 0.0.0.0:33223 0.0.0.0:* LISTEN

TCP 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN

TCP 0 0 0.0.0.0:111 0.0.0.0:* LISTEN

TCP6 0 0:: 1:25:::* LISTEN

TCP6 0 0:: 60042:::* LISTEN

TCP6 0 0:: £ º::* LISTEN

TCP6 0 0:: £ º::* LISTEN

TCP6 0 0 111.111.111.120:80 111.111.111.114:1119 established

TCP6 0 0 111.111.111.120:80 111.111.111.114:1123 established

TCP6 0 0 111.111.111.120:80 111.111.111.114:1125 time_wait

TCP6 0 0 111.111.111.120:80 111.111.111.114:1112 time_wait

TCP6 0 0 111.111.111.120:80 111.111.111.114:1110 time_wait

TCP6 0 0 111.111.111.120:80 111.111.111.114:1122 established

TCP6 0 0 111.111.111.120:80 111.111.111.114:1114 time_wait

TCP6 0 0 111.111.111.120:80 111.111.111.114:1117 time_wait

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The second method:

root@debian:/home# lsof-i:80

COMMAND PID USER FD TYPE DEVICE size/off NODE NAME

Apache2 2301 Root 4u IPv6 7298 0t0 TCP *:http (LISTEN)

Apache2 2497 Www-data 4u IPv6 7298 0t0 TCP *:http (LISTEN)

Apache2 2498 Www-data 4u IPv6 7298 0t0 TCP *:http (LISTEN)

Apache2 2499 Www-data 4u IPv6 7298 0t0 TCP *:http (LISTEN)

Apache2 2500 Www-data 4u IPv6 7298 0t0 TCP *:http (LISTEN)

Apache2 2501 Www-data 4u IPv6 7298 0t0 TCP *:http (LISTEN)

Apache2 6108 Www-data 4u IPv6 7298 0t0 TCP *:http (LISTEN)

Apache2 6117 Www-data 4u IPv6 7298 0t0 TCP *:http (LISTEN)

Apache2 6118 Www-data 4u IPv6 7298 0t0 TCP *:http (LISTEN)

MySQL default port

root@debian:/home# lsof-i:3306

COMMAND PID USER FD TYPE DEVICE size/off NODE NAME

Mysqld 2992 MySQL 10u IPv4 9546 0t0 TCP localhost:mysql (LISTEN)

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