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Other posts seems to be addressing more complicated network connection issues from the command line.

The Unity panel Network indicator/button doesn't respond too well sometimes - it keeps trying to connect to a network even when i click on "disconnect", stuff like that.

So I want to go command line for the control. I don't like GUIs anyway.

Is there not some simple command line tool which can do something like the following?

wifi connect MyNetworkNameA
wifi disconnect
wifi connect MyNetworkNameB
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3  
Depends , what wireless security ? This is covered in detail here - help.ubuntu.com/community/NetworkConfigurationCommandLine/… – bodhi.zazen May 6 '14 at 15:27
up vote 64 down vote accepted

I think you want to keep using managed interface (by NetworkManager). nmcli is a command‐line tool for controlling NetworkManager.

  • To see list of saved connections, use (<SavedWiFiConn>)

    nmcli c
    
  • To see list of available WiFi hotspots (<WiFiSSID>)

    nmcli d wifi list
    

    or:

    sudo iwlist wlan0 scanning
    
  • To see list of interfaces (<WifiInterface>)

    ifconfig -a
    

Just change <WifiInterface>, <WiFiSSID>, <WiFiPassword> in the following commands to reflect your setup. If WiFi info already saved, easier way using <SavedWiFiConn> name of connection as it was saved in NetworkManager.

Ubuntu 16.04

##disconnect
nmcli d disconnect <WifiInterface>

##connect
nmcli d connect <WifiInterface>

Another way:

##disconnect
nmcli c down <SavedWiFiConn>

##connect
nmcli c up <SavedWiFiConn>

Ubuntu 15.10 & previous

##disconnect
nmcli d disconnect iface <WifiInterface>

##connect
nmcli d wifi connect <WiFiSSID> password <WiFiPassword> iface <WifiInterface>

Another way:

##disconnect:
nmcli c down id <SavedWiFiConn>

##connect:
nmcli c up id <SavedWiFiConn>

Reference: man nmcli

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1  
Works like a charm! And, as suspected, the command line responds immediately, while the GUI can be sluggish, uncooperative, and unresponsive sometimes. – cmo May 6 '14 at 15:55
1  
Saved my day when I lost my Unity dash and taskbar, and the Network Settings dialog kept on crashing upon any kind of network connection establishment. – Janaka Bandara Nov 27 '14 at 1:21
1  
@kirill_igum , sorry to be late quiet busy, You may use cron for scheduling wifi scan using iwlist wlan0 scanning or nmcli d wifi list then nmcli to connect to the corresponding wifi network depending on your needs. – Sneetsher Jan 11 at 21:59
1  
The command that I was issuing was giving an error. I was issuing this command: nmcli c up id "Apollo III Connect" It gave an error. When I leave out the word id and typed this it connects without error: nmcli c "Apollo III Connect". I understand how to connect it now. You're saying id as the parameter and saying replace the word id with the name of the connection, which you are naming <WiFiConn>. Thanks! – L. D. James Jun 15 at 22:48
1  
mcli tool, version 1.2.0 – L. D. James Jun 15 at 23:48

If your wi-fi access point is saved, it will auto-connect. Turn wireless on or off with a simpler command:

nmcli nm wifi on
nmcli nm wifi off

on newer version:

nmcli radio wifi on
nmcli radio wifi off

For reference, see man nmcli.

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Yep, this the best (simpler then mine :) ) when working with single WiFi network. – Sneetsher Apr 13 '15 at 8:27
1  
How do you make NM enable wifi automatically during boot? Every time I reboot, Network Manager starts with wifi disabled. – Cerin Jul 25 '15 at 21:46
    
@Cerin, you may try adding this command to startup applications, see askubuntu.com/questions/243139/… – Sneetsher Jan 11 at 21:47
1  
Note the nm option has been removed or replaced (?) in newer versions of nmcli – dgorissen Mar 18 at 14:30
    
@dgorissen, yes it seems changed on newer version, replace nm with radio. I've updated this answer. – Sneetsher Apr 1 at 18:31

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