1.nmcli
[root@cloud ~]# nmcli --help
Usage: nmcli [OPTIONS] OBJECT { COMMAND | help }

OPTIONS
  -o[verview]                                    overview mode (hide default values)
  -t[erse]                                       terse output
  -p[retty]                                      pretty output
  -m[ode] tabular|multiline                      output mode
  -c[olors] auto|yes|no                          whether to use colors in output
  -f[ields] <field1,field2,...>|all|common       specify fields to output
  -g[et-values] <field1,field2,...>|all|common   shortcut for -m tabular -t -f
  -e[scape] yes|no                               escape columns separators in values
  -a[sk]                                         ask for missing parameters
  -s[how-secrets]                                allow displaying passwords
  -w[ait] <seconds>                              set timeout waiting for finishing operations
  -v[ersion]                                     show program version
  -h[elp]                                        print this help

OBJECT
  g[eneral]       NetworkManager's general status and operations
  n[etworking]    overall networking control
  r[adio]         NetworkManager radio switches
  c[onnection]    NetworkManager's connections
  d[evice]        devices managed by NetworkManager
  a[gent]         NetworkManager secret agent or polkit agent
  m[onitor]       monitor NetworkManager changes

2.nmcli c -h

[root@cloud ~]# nmcli c -h
Usage: nmcli connection { COMMAND | help }

COMMAND := { show | up | down | add | modify | clone | edit | delete | monitor | reload | load | import | export }

  show [--active] [--order <order spec>]
  show [--active] [id | uuid | path | apath] <ID> ...

  up [[id | uuid | path] <ID>] [ifname <ifname>] [ap <BSSID>] [passwd-file <file with passwords>]

  down [id | uuid | path | apath] <ID> ...

  add COMMON_OPTIONS TYPE_SPECIFIC_OPTIONS SLAVE_OPTIONS IP_OPTIONS [-- ([+|-]<setting>.<property> <value>)+]

  modify [--temporary] [id | uuid | path] <ID> ([+|-]<setting>.<property> <value>)+

  clone [--temporary] [id | uuid | path ] <ID> <new name>

  edit [id | uuid | path] <ID>
  edit [type <new_con_type>] [con-name <new_con_name>]

  delete [id | uuid | path] <ID>

  monitor [id | uuid | path] <ID> ...

  reload

  load <filename> [ <filename>... ]

  import [--temporary] type <type> file <file to import>

  export [id | uuid | path] <ID> [<output file>]

3.nmcli c mod -h

[root@cloud ~]# nmcli c mod -h
Usage: nmcli connection modify { ARGUMENTS | help }

ARGUMENTS := [id | uuid | path] <ID> ([+|-]<setting>.<property> <value>)+

Modify one or more properties of the connection profile.
The profile is identified by its name, UUID or D-Bus path. For multi-valued
properties you can use optional '+' or '-' prefix to the property name.
The '+' sign allows appending items instead of overwriting the whole value.
The '-' sign allows removing selected items instead of the whole value.

Examples:
nmcli con mod home-wifi wifi.ssid rakosnicek
nmcli con mod em1-1 ipv4.method manual ipv4.addr "192.168.1.2/24, 10.10.1.5/8"
nmcli con mod em1-1 +ipv4.dns 8.8.4.4
nmcli con mod em1-1 -ipv4.dns 1
nmcli con mod em1-1 -ipv6.addr "abbe::cafe/56"
nmcli con mod bond0 +bond.options mii=500
nmcli con mod bond0 -bond.options downdelay

4.示例(添加网卡及参数)

[root@cloud ~]# nmcli c add con-name ens160 type ethernet autoconnect yes ifname ens160 ip4 10.1.1.170/24 ipv4.dns "210.21.196.6 202.96.128.86" gw4 10.1.1.254