参数

编辑param.sh

#!/bin/bash

name="guo90"
echo $name
echo "hello, i know you are \"$name\""

for skill in Shell Python Java; do
    echo "I am good at ${skill}Script"
done


for file in $(ls /home); do
echo "/home目录下子目录：$file"
done

readonlyVar=123
readonly readonlyVar
echo "只读变量readonlyVar:$readonlyVar"
readonlyVar=111


echo "下面开始拼接"
greeting2="hello, $name !"
echo $greeting1  $greeting2
echo ${#greeting1}
echo ${#greeting2}


greeting3='hello, '$name' !'
greeting4='hello, $name !'
echo $greeting3  $greeting4
echo ${#greeting3}
echo ${#greeting4}


echo "下面开始截取"
echo "greeting4的第3开始截取5位：${greeting4:3:5}"
echo "g在greeting3中第几位："`expr index "$greeting3" g`




array_name=(guo 90)
echo "返回数组全部，${array_name[@]}"
echo "返回数组长度，${#array_name[@]}"
echo "返回元素1，${array_name[0]}"
echo "返回元素2，${array_name[1]}"
echo "返回元素2长度，${#array_name[1]}"

执行param.sh

./param.sh 
guo90
hello, i know you are "guo90"
I am good at ShellScript
I am good at PythonScript
I am good at JavaScript
/home目录下子目录：admin
/home目录下子目录：tester1
只读变量readonlyVar:123
./param.sh: line 19: readonlyVar: readonly variable
下面开始拼接
hello, guo90 !
0
14
hello, guo90 ! hello, $name !
14
14
下面开始截取
greeting4的第3开始截取5位：lo, $
g在greeting3中第几位：8
返回数组全部，guo 90
返回数组长度，2
返回元素1，guo
返回元素2，90
返回元素2长度，2