Simulate Linux boot service to detect print effects

Linux Boot detection service status display Success or FailureThe state. There is no discovery, regardless of the name of the service, the last paragraph can be Snap To displayIt?

Can we write a script to simulate it? ^_^

 来我们首先来分析一下： 首先，确定一下当前终端的宽度 其次，确定一下服务状态显示所占的字符数 再次，确定一下服务名称所占的字符数 剩余的就是打印空格了

Now that's the idea, let's write a script, edit service_status.sh.

#!/bin/bash##获取当前终端的宽度COLUMNS=`resize -u | grep "COLUMNS=" | cut -d "=" -f2 | cut -d ";" -f1`#判断当前终端宽度是否为空,为空则设置默认值为80[ -z $COLUMNS ] && COLUMNS=‘80‘#当前终端宽度减去服务状态显示所在的字符数,设置服务状态显示字符数为10,[   OK    ][ FAILED  ]S_COLUMNS=$[$COLUMNS-10]#设置颜色变量RED=‘\033[31m‘GREEN=‘\033[32m‘NORMAL=‘\033[0m‘##设置成功服务的显示success(){        STRING=$1        #真实需要打印的空格数        R_COLUMNS=$[$S_COLUMNS-${#STRING}]        #显示服务名称,不换行        echo -n "$STRING"        #接着打印空格        for i in `seq 1 $R_COLUMNS`;do                echo -n " "        done        #最后打印服务成功字样        echo -e "[   ${GREEN}OK${NORMAL}   ]"}failed(){        STRING=$1        #真实需要打印的空格数        R_COLUMNS=$[$S_COLUMNS-${#STRING}]        #显示服务名称,不换行        echo -n "$STRING"        #接着打印空格        for i in `seq 1 $R_COLUMNS`;do                echo -n " "        done        #最后打印服务成功字样        echo -e "[ ${RED}FAILED${NORMAL} ]"}

Next, edit the other file test.sh, which calls the service_status.sh write function.

#!/bin/bash#. ./service_status.sh#测试启动成功服务的显示success "Service start success!"#测试启动失败服务的显示failed "Service start failed~"

Next, execute permissions for test.sh chmod u+x test.sh
Start execution#./test.sh

Simulate Linux boot service to detect print effects