This directory of Linux commands is from Linux in a Nutshell, 5th Edition.
Click on any of the 687 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Bookshelf.
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netstat
netstat [options] [delay]
TCP/IP command. Show network status. Print information on active sockets, routing tables, interfaces, masquerade connections, or multicast memberships. By default, netstat lists open sockets. When a delay is specified, netstat will print new information every delay seconds.
Options
The first five options (-g, -i, -M, -r, and -s) determine what kind of information netstat should display.
Show multicast group memberships.
Show all network interfaces, or just the interface specified by name.
Show masqueraded connections.
Show kernel routing tables.
Show statistics for each protocol.
Show all entries.
Show connections only for the specified address family. Accepted values are inet, unix, ipx, ax25, netrom, and ddp. Specify multiple families in a comma-separated list.
Display information continuously, refreshing once every second.
Print routing information from the route cache.
Increase level of detail in reports. Use twice for maximum detail.
Print routing information from the forward information database (FIB). This is the default.
Show only listening sockets.
Show network addresses, ports, and users as numbers.
Show host addresses as numbers, but resolve others.
Show ports as numbers, but resolve others.
Show user ID numbers for users, but resolve others.
Where possible, print symbolic host, port, or usernames instead of numerical representations. This is the default behavior.
Include information on network timers.
Show the process ID and name of the program owning the socket.
Limit report to information on TCP sockets.
Limit report to information on UDP sockets.
Verbose mode.
Limit report to information on raw sockets.
