Usage: nmcli connection modify { ARGUMENTS | help }
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ARGUMENTS := [id | uuid | path] <ID> ([+|-]<setting>.<property> <value>)+
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Modify one or more properties of the connection profile.
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The profile is identified by its name, UUID or D-Bus path. For multi-valued
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properties you can use optional '+' or '-' prefix to the property name.
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The '+' sign allows appending items instead of overwriting the whole value.
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The '-' sign allows removing selected items instead of the whole value.
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Examples:
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nmcli con mod home-wifi wifi.ssid rakosnicek
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nmcli con mod em1-1 ipv4.method manual ipv4.addr "192.168.1.2/24, 10.10.1.5/8"
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nmcli con mod em1-1 +ipv4.dns 8.8.4.4
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nmcli con mod em1-1 -ipv4.dns 1
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nmcli con mod em1-1 -ipv6.addr "abbe::cafe/56"
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nmcli con mod bond0 +bond.options mii=500
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nmcli con mod bond0 -bond.options downdelay