我们在使用bash命令时,会经常使用二次tab键进行补齐。
例如我们常用的telnet命令,在输入二次tab键时,会列出当前系统配置的所有主机名,供选择
# 输入 telnet <Tab> <Tab> [huangcihui:/home/huangcihui] telnet ::1 localhost localhost4 localhost4.localdomain4 localhost6 localhost6.localdomain6 localhost.localdomain [huangcihui:/home/huangcihui] telnet
在输入telnet参数过程中按回车,系统也会自动补全主机名
#输入 telnet l<Tab>
[huangcihui:/home/huangcihui] telnet localhost
其它常用命令,也会有这个功能。 例如systemctl,输入二次tab键时会列出systemctl所有子命令参数
#systemctl <Tab><Tab> [huangcihui:/home/huangcihui] systemctl add-requires daemon-reexec enable hybrid-sleep kill list-units reload-or-restart set-property suspend add-wants daemon-reload exit is-active link mask reload-or-try-restart show switch-root cancel default force-reload is-enabled list-dependencies poweroff rescue show-environment try-restart cat delete get-default is-failed list-jobs preset reset-failed snapshot unmask condreload disable halt isolate list-sockets reboot restart start unset-environment condrestart edit help is-system-running list-timers reenable set-default status condstop emergency hibernate kexec list-unit-files reload set-environment stop [huangcihui:/home/huangcihui] systemctl
那么,自己开发的程序,能不能实现Tab自动补全? 答案是肯定的,借助bash的complete命令即可。
假设我们新写了一个命令叫tel,我们想让它实现telnet的被全主机名功能,用这个命令即可:complete -A hostname tel 效果如下:
[huangcihui:/home/huangcihui] complete -A hostname tel [huangcihui:/home/huangcihui] #tel l<Tab> [huangcihui:/home/huangcihui] tel localhost
而像systemctl这种补全子命令的功能,要怎么做呢? 下面我演示一下怎么让git命令实现子命令补全功能
[huangcihui:/home/huangcihui] complete -W "add checkout clone commit diff pull push status" git [huangcihui:/home/huangcihui] #git <Tab> [huangcihui:/home/huangcihui] git add checkout clone commit diff pull push status [huangcihui:/home/huangcihui] git
complete还有更多复杂的用法,有兴趣可以参考这篇文章
https://blog.csdn.net/koprvhdix/article/details/81036240
Linux Shell 命令自动补全(各方资料汇总补全版) Clockworkai
下面是我使用complete命令帮我自定义的dockerq命令进行自动补全的函数
# 新建一个命令dockerq 用于快速操作docker __dockerq() { COMPREPLY=() # 清空候选列表 local cur=${COMP_WORDS[COMP_CWORD]}; # 用户输入单词赋值给cur local cmd=${COMP_WORDS[COMP_CWORD-1]}; # 用户正在操作的命令或者子命令 case $cmd in 'dockerq') # 获取docker所有命令 # local cmdlist=$(docker --help|awk '{if ($1 == "Commands:") { v_showFlag = 1; next; } else if ($1 == "") v_showFlag = 0; if (v_showFlag) print $1;}') cmdlist="images pull start run" # 获取以cul开头的所有命令 local wordlist="$(compgen -W "${cmdlist}" -- $cur)" # 给候选列表赋值 COMPREPLY=( ${wordlist} ) ;; 'images') #使用docker images获取所有镜像名称 local cmdlist=$(docker images|awk '{if (NR != 1) print $1;}') # 获取以cul开头的所有命令 local wordlist="$(compgen -W "${cmdlist}" -- $cur)" # 给候选列表赋值 COMPREPLY=( ${wordlist} ) ;; 'run') #使用docker ps获取所有容器名称 local cmdlist=$(docker ps -a|awk '{if (NR != 1) print $NF;}') # 获取以cul开头的所有命令 local wordlist="$(compgen -W "${cmdlist}" -- $cur)" # 给候选列表赋值 COMPREPLY=( ${wordlist} ) ;; '*') ;; esac if [[ "${COMP_WORDS[1]}" == "read" && ${COMP_CWORD} -eq 2 ]]; then local pro=($(pwd)) cd /data compopt -o nospace COMPREPLY=($(compgen -d -f -- $cur)) cd $pro fi return 0 } complete -F __dockerq dockerq alias dockerq=docker
使用dockerq命令时,按Tab键可以自动补齐docker镜像或者容器的名称,非常方便
[root@localhost ~]# dockerq images pull run start [root@localhost ~]# dockerq run adoring_wozniak charming_ptolemy composetest_web_1 determined_hodgkin exciting_cartwright hardcore_mestorf hungry_mclean mystifying_cohen nginx001 thirsty_franklin alptest1 composetest_redis_1 cpu_set_demo example1 exp1 heuristic_cannon magical_cartwright nginx phpfpm thirsty_merkle [root@localhost ~]# dockerq run ^C [root@localhost ~]# dockerq images abh1nav/dockerui composetest_web feisky/nginx mysql redis alpine docker/compose feisky/php-fpm nginx todoapp busybox dockerinpractice/dockerfile-from-image hello-world node ubuntu centurylink/dockerfile-from-image dockerinpractice/docker-image-graph lukapeschke/dfa python wordpress [root@localhost ~]# dockerq images
希望这篇文章对你有帮助。
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