自动补全命令,就是在我们输入命令的时候使用Tab键可以补全命令,或展示可能的命令
如nginx目录下
我们看到有以下文件
1. 只有一条命令满足的情况
输入部分指令后,按下tab键,如果只有一个命令满足,则会补全完整的命令
2. 有多条命令满足的情况
此时我们按下Tab键,不会完成补全,这是如果我们连续按下两次Tab键,就会把所有复合的命令都展示出来
这时我们继续完善命令即可。在完善时可以充分使用Tab键自动补全
如何补全我们自己写的脚本命令呢?
我们找一个场景吧:
一个服务器上启动多个tomcat
在x_install文件夹中放了多个服务
1.首选需要我们自己编写命令脚本:
这里我们用tomcat的命令脚本举例,包含了启动、暂停、重启、状态、日志等功能
#!/bin/bash
BUILD_ID=DONTKILLME
TOMCAT_HOME=/opt/tomcat
serviceNames=$(ls /opt/tomcat/x_install/ |grep Service)
commands='start stop restart status log errlog'
RETVAL="0"
serviceName=$1
if [ x"$1" = x ]; then
echo '请输入服务名:'$serviceNames
exit 1
fi
isService=$(echo $serviceNames | grep "${serviceName}")
if [[ "$isService" = "" ]]; then
echo '无效服务名'
echo '服务名:'$serviceNames
exit 1
fi
if [ x"$2" = x ]; then
echo '请输入执行命令:'$commands
exit $RETVAL
fi
isCommand=$(echo $commands | grep "$2")
if [[ "$isCommand" = "" ]]; then
echo '无效执行命令'
echo '命令:'$commands
exit $RETVAL
fi
export CATALINA_HOME=$TOMCAT_HOME
export CATALINA_BASE=$CATALINA_HOME/x_install/$serviceName
num=0
if [ x"$3" != x ]; then
num=$3
fi
start() {
ps aux |grep $CATALINA_BASE/conf |grep -v "grep" >/dev/null
if [ $? -eq 0 ];then
echo $serviceName" is running"
else
echo "tomcat is down"
find / |grep "/jre/lib/rt.jar" |grep -v "grep" >/dev/null
if [ $? -eq 0 ];then
javahome=$(find / |grep "/jre/lib/rt.jar" |head -1 |awk '{print $1}')
export JRE_HOME=${javahome%*/lib/rt.jar}
export PATH=$JRE_HOME/bin:$PATH
export CLASSPATH=.:$JRE_HOME/lib
if [[ "$serviceName" = "ReviewService" ]]; then
echo $serviceName' 设置运行内存1024m'
export JAVA_OPTS='-Xms128m -Xmx1024m'
elif [[ "$serviceName" = "BiddingService" ]]; then
echo $serviceName' 设置运行内存1024m'
export JAVA_OPTS='-Xms128m -Xmx1024m'
elif [[ "$serviceName" = "OpenBiddingService" ]]; then
echo $serviceName' 设置运行内存1024m'
export JAVA_OPTS='-Xms128m -Xmx1024m'
else
export JAVA_OPTS='-Xms128m -Xmx512m'
fi
else
echo "未找到java环境"
exit $RETVAL
fi
if [ $num != 0 ]; then
echo "开启调试:端口[$num]"
declare -x CATALINA_OPTS="-server -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=$num"
fi
$CATALINA_HOME/bin/startup.sh
if [ $? -eq 0 ];then
echo $serviceName" start successfull"
else
echo $serviceName" start fail"
fi
fi
}
stop(){
ps aux |grep $CATALINA_BASE/conf |grep -v "grep" >/dev/null
if [ $? -eq 0 ];then
echo $serviceName" is running"
echo "now start stop "$serviceName
$CATALINA_HOME/bin/shutdown.sh
tomcatpid=$(ps aux |grep $CATALINA_BASE/conf |grep -v "grep"|awk '{print $2}')
if [ x"$tomcatpid" != x ]; then
kill -9 $tomcatpid
fi
echo $serviceName" already stoped"
else
echo $serviceName" is stoped"
fi
}
log(){
if [ $num != 0 ]; then
tail -n $num $CATALINA_BASE/logs/catalina.out
else
tail -f $CATALINA_BASE/logs/catalina.out
fi
}
errlog(){
if [ $num != 0 ]; then
tail -n $num $CATALINA_BASE/logs/catalina.out |grep Exception
else
tail -f $CATALINA_BASE/logs/catalina.out |grep Exception
fi
}
status(){
ps aux |grep $CATALINA_BASE |grep -v "grep" >/dev/null
if [ $? -eq 0 ];then
echo $serviceName" is running"
else
echo $serviceName" is stoped"
fi
}
# See how we were called.
usage()
{
echo "Usage: $1{服务名称} $2 {start|stop|restart|status|log|errlog}"
RETVAL="2"
}
case "$2" in
start)
start
;;
stop)
stop
;;
restart)
stop
start
;;
status)
status
;;
log)
log
;;
errlog)
errlog
;;
*)
usage
;;
esac
exit $RETVAL
把脚本放到我们自己自定义命令的目录下
2.在任意目录下可以访问:
我们可以选择使用软连接的方式
#ln -s /opt/tomcat/tomcat.sh /usr/sbin/tomcat
到这里, 你就可以在任意目录下 使用 tomcat 命令了
到这里我们使用Tab键,只能补全对应文件夹下的文件,不满足我们的要求
3.编写bash_completion脚本:
_tomcat()
{
local cur prev serviceNames commands
COMPREPLY=()
cur="${COMP_WORDS[COMP_CWORD]}"
prev="${COMP_WORDS[COMP_CWORD-1]}"
serviceNames=$(ls /opt/tomcat/x_install/ |grep Service)
commands='start stop restart status log errlog'
serviceNames_str=`echo ${serviceNames[@]} | sed 's/ /\n/g'| sort -u`
if ((COMP_CWORD == 1)); then
COMPREPLY=( $(compgen -W "${serviceNames_str[*]}" -- $cur) )
fi
if ((COMP_CWORD == 2)); then
COMPREPLY=( $(compgen -W "${commands[*]}" -- $cur) )
fi
}
complete -F _tomcat tomcat
4. 切换目录
#cd /etc/bash_completion.d
上传脚本文件 tomcat.bash
5. 生效自动补全脚本
#source /usr/share/bash-completion/bash_completion
6. 这时就可以自动提示我们的命令了
tomcat 命令后 第一个参数会提示指定目录的文件夹,在自定脚本中设置的serviceNames
第二个参数会提示需要的命令
详解:
_tomcat 定义函数名
cur="${COMP_WORDS[COMP_CWORD]}" 我们正在输入的词
prev="${COMP_WORDS[COMP_CWORD-1]}" 命令中上一个词
serviceNames 存放我们需要自动补全的服务(文件夹名称)
commands 可以使用的命令集合
COMP_CWORD 第几个词
COMPREPLY=( $(compgen -W "${serviceNames_str[*]}" -- $cur) ) 输出或自动补全文章来源:https://www.toymoban.com/news/detail-487705.html
complete -F _tomcat tomcat 指定当命令为tomcat时,使用_tomcat 补全命令文章来源地址https://www.toymoban.com/news/detail-487705.html
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