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shell常用脚本

计算程序运行时间​

按秒计算​

#!/bin/bash

start=$(date +%s)
#你要执行的操作


end=$(date +%s)
take=$(( end - start ))
echo Time taken to execute commands is ${take} seconds.

按毫秒计算​

#!/bin/bash
start=$(date +%s%3N)
# 你要执行的操作

end=$(date +%s%3N)
take=`expr ${end} - ${start}`
echo Time taken to execute commands is ${take} ms.

循环执行​

#!/bin/bash
#一般先声明数组，在里面填循环的东西
ips=(192.168.1.1 192.168.1.2)
for ip in ${ips[@]}
do
    echo "${ip}"
done

# 从第二个元素开始
for ip in ${ips[@]:1}
do
    echo "${ip}"
done
while true:
do
    echo "loop"
done
n=0
while [ $n -le 100 ]
do
    echo "loop"
    let n++
done

条件判断​

字符串判断​

#!/bin/bash
ip="192.168.1.1"
if [ "${ip}"x == ""x ];
then
    echo "eqal"
fi

数字判断​

#!/bin/bash
ip=192
if [ ${ip} -eq 192 ];
then
    echo "equal"
fi

文件判断​

#!/bin/bash
ip="192"
if [ -d ${ip} ];
then
    echo "exist"
fi