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I'm going to be fiddling around with my wireless card's settings by using iwconfig. Before doing this, I would like to back up my current settings in case anything goes horribly wrong.

Where are the config options for iwconfig stored so I can back them up, and restore them when needed?

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If you use Network Manager settings are in /etc/NetworkManager/system-connections/.

In that folder you have all connection, in My case:

Auto router03  Auto router02
Auto router04  Auto dlink_DWR-512  
Wired connection 1

After Auto is name of SSID

example

zzz@zzz ~ $ sudo cat /etc/NetworkManager/system-connections/Auto\ dlink_DWR-512 
[connection]
id=Auto dlink_DWR-512
uuid=6c358756-06b1-4c5b-9eca-a6c8d52a5456
type=802-11-wireless

[802-11-wireless]
ssid=dlink_DWR-512
mode=infrastructure
mac-address=00:21:5C:8A:60:AB

[ipv6]
method=auto

[ipv4]
method=auto
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