shell脚本基础

基础命令示例

#!/bin/bash 固定格式
echo "input str" 输出字符串到屏幕
read 变量名 读取键盘输入
test $first == $second && echo "dengyv" || echo "notdeng" 判断字符串是否相等
echo "file name" $0 。脚本名称
echo "total param num" $# 。参数个数
echo "whole param" $@ 。输出所有参数
echo "first param" $1 。输出第一个参数

[ "$varname" == "hello" ] 。判断字符串是否相等，注意[ ] 内部要用空格和代码隔开，$varname要加双引号

shell判断语句

read -p "y/n?:" value
if [ "$value" == "Y" ] || [ "$value" == "y" ]; then
echo "your input is Y"
exit 0
fi
if [ "$value" == "N" ] || [ "$value" == "n" ]; then
echo "your input is Y"
exit 0
else
echo "not illegal"
fi

#case语句
case $1 in
"a")
echo "a"
;;
"b")
echo "b"
;;
*)
echo "other"
;;
esac

shell脚本函数示例

#!/bin/bash
print()
{
        echo "param 1:$1"
        echo "param 2:$2"
}
print a b #调用print函数，并传入a,b两个参数

while循环

while [ "$value" != "close" ]
do
        read -p "your input" str 
        echo "ok"
done

echo "while over"