Linux command completion parameter hint program bash-completion

Bash-completion can prompt commands, prompt command parameters, in CentOS7, many of the daily management of the command format is longer such as NMCLI, IP, firewall-cmd, SYSTEMCTL, etc., with bash-completion can quickly, Learn the use of new commands in a friendly way.

When the system is minimized, it is not installed by default, since the software is installed in the Epel library, install Epel-release first. Note that after the installation is done in the new shell, you need to re-connect or create a new bash.

Yum Install Epel-release-yyum Install bash-completion-y

as follows, the software information has been installed:

[[email protected] ~]# rpm -qi bash-completion name        : bash-completion               Relocations:  (not relocatable) version     : 1.3                            Vendor: Fedora ProjectRelease      : 7.el6                        build date: 2013 April 02   Tuesday   23:00 20 sec install date: 2017 June 21   Wednesday  09 46 minutes 44 seconds      Build  host: buildvm-02.phx2.fedoraproject.orggroup      : system  environment/shells        Source RPM: bash-completion-1.3-7.el6.src.rpmSize        : 590294                            license: gplv2+signature    : rsa/8, 2013 April 03   Wednesday  07 44 minutes, 10 seconds, key id  3b49df2a0608b895packager    : fedora projecturl        : http://bash-completion.alioth.debian.org/Summary     :  programmable completion for bashdescription :bash-completion is a  collection of shell functions that take advantage of the  Programmable completion feature of bash.

Use the TAB key to complete the command, complete parameters as shown below, CentOS7 system commands are more readable, parameters and options to use more friendly:

#bash-completion function demonstration, TAB key to complement common command parameter options                   [[email protected] ~]# systemsystemctl                         systemd-inhibitsystemd-analyze                  systemd-loginctlsystemd-ask-password             systemd-machine-id-setupsystemd-cat                      systemd-notifysystemd-cgls                      systemd-nspawnsystemd-cgtop                    systemd-pathsystemd-coredumpctl              systemd-runsystemd-delta                    systemd-stdio-bridgesystemd-detect-virt              systemd-sysv-convertsystemd-escape                    systemd-tmpfilessystemd-firstboot                systemd-tty-ask-password-agentsystemd-hwdb                     [[email protected] ~]#  Systemctl add-requires           hybrid-sleep            reload-or-restartadd-wants               is-active               reload-or-try-restartcancel                  is-enabled              rescuecat                     is-failed               reset-failedcondreload              isolate                 restartcondrestart             Is-system-running      set-defaultcondstop                kexec                   set-environmentdaemon-reexec          kill                     set-propertydaemon-reload          link                    showdefault                  list-dependencies      show-environmentdelete                  list-jobs               snapshotdisable                 list-sockets           startedit                     list-timers            statusemergency               list-unit-files         stopenable                  list-units              suspendexit                    mask                    switch-rootforce-reload           poweroff                 try-restartget-default            preset                  unmaskhalt                     reboot                  unset-environmenthelp                    reenable                hibernate               reload                  [[email protected] ~]# nmcli  agent       device      help         networking  connection  general      monitor     radio       [[email  protected] ~]# nmcli connection add      delete    edit     help     load      monitor  show     clone    down      export   import   modify   reload   up        [[email protected] ~]# nmcli connection  Edit con-name  ens192    id        type       ens160    help      path       uuid      [[email protected] ~]# nmcli  connection add autoconnect                       ipv4.dns-prioritycon-name                           ipv4.dns-searchconnection.autoconnect            ipv4.gatewayconnection.autoconnect-priority   ipv4.ignore-auto-dnsconnection.autoconnect-slaves     ipv4.ignore-auto-routesconnection.gateway-ping-timeout  ipv4.may-failconnection.id                     ipv4.methodconnection.interface-name         ipv4.never-defaultconnection.lldp                   ipv4.route-metricconnection.master                 ipv4.routesconnection.metered                ipv6.addressesconnection.permissions            ipv6.addr-gen-modeconnection.read-only               ipv6.dhcp-hostnameconnection.secondaries            Ipv6.dhcp-send-hostnameconnection.slave-type            ipv6.dnsconnection.stable-id              ipv6.dns-optionsconnection.timestamp              ipv6.dns-priorityconnection.type                   ipv6.dns-searchconnection.uuid                    ipv6.gatewayconnection.zone                   ipv6.ignore-auto-dnshelp                               ipv6.ignore-auto-routesifname                            ipv6.ip6-privacyipv4.addresses                    ipv6.may-failipv4.dad-timeout                   ipv6.methodipv4.dhcp-client-id               ipv6.never-defaultipv4.dhcp-fqdn                    ipv6.route-metricipv4.dhcp-hostname                ipv6.routes--More--^C[[email protected]  ~]# firewall-cmd ----add-forward-port=--add-icmp-block=--add-icmp-block-inversion--add-interface=-- add-lockdown-whitelist-command=--add-lockdown-whitelist-context=--add-lockdown-whitelist-uid=-- Add-lockdown-whitelist-user=--add-masquerade--add-port=--add-protocol=--add-rich-rule=--add-service=--add-source=--add-source-port=--change-interface=-- change-source=--change-zone=-- Complete-reload--direct--get-active-zones--get-default-zone--get-icmptypes--get-ipset-types--get-log-denied--get-services --get-zone-of-interface=--get-zones--help--info-icmptype--info-ipset--info-service--info-zone--more--[[email  protected] ~]# firewall-cmd --

Linux command completion parameter hint program bash-completion