常用命令

更全的命令可以看：api大全 (opens new window)

变量

# 注意，=两边不能加空格
name="hdy"

echo ${name}
echo $name

names=("张三" "李四" "王五")

# 注：大括号不能省
for name in ${names[*]}
do
    echo $name
done

条件判断

• shell的数字、字符串、文件的判断写法都不一样

if test 1 -eq 1 ;then
    echo "true"
fi

# 注：中括号里面的空格都要对得上
if [ 1 = 1 ];then
    echo "true"
fi

# 注：不能加中括号
if test "10:10" = "10:10" ; then
    echo "true"
fi

执行流程

[ 中括号里面的空格不能少 ]

if [ 1 = 2 ];then
    echo "相等"
elif [ 2 = 2 ];then
    echo "这对相等"
else
    echo "不相等"
fi

i=0
while test ${i} -lt 10 
do
    echo ${i}
    i=`expr ${i} + 1`
done

• 直接遍历数组

for i in 1 2 3 4
do
    echo ${i}
done

• 遍历变量数组

names=("老黄" "老张" "老王")

for name in ${names[*]}
do
    echo ${name}
done

时间

echo `date`

# 格式化时间
echo `date "+%H:%M:%S"`

# 指定时间做事
while true
do
    sleep 1

    # 注：加双引号格式化成字符串，不加双引号格式化成数字
    current=`date "+%S"`
    echo ${current} >> log.txt
    if test ${current} -eq '11'; then
        echo `date "+%H:%M:%S"` >> log.txt
    fi
done

自动部署脚本

• pm2启动

PATH_DEPLOY=/usr/local/html
PATH_ROOT=/home/app/loan
PATH_PROJECT=/home/app/loan/02_src/cash-loans-front

update() {
    cd ${PATH_ROOT}
    git pull
    cd ${PATH_PROJECT}
    npm i
    npm run build-only
    mv ${PATH_DEPLOY} ${PATH_DEPLOY}_temp
    mv ./dist ${PATH_DEPLOY}
    rm -rf ${PATH_DEPLOY}_temp
    echo "完成更新:" `date +"%Y-%m-%d %H:%M:%S"` >> log.txt
}

update

while true
do
    current=`date +%H`
    if test ${current} -eq '03';then
        update
    fi

    sleepTime=`expr 60 \* 58`
    # sleepTime=`expr 60 \* 3`
    sleep ${sleepTime}
done