shell脚本字符串和数组的使用操作方法

#! /bin/bashusername="mayuan"str_1="hello ${username}" str_2='hello ${username}'echo $str_1 # hello mayuanecho $str_2 # hello ${username}

#! /bin/bashusername="mayuan"echo ${#username} # 6

#! /bin/bashusername="mayuan"echo ${username:1:3} # 从第二个字符开始截取3个字符输出"ayu"

#! /bin/bashusername="mayuan"echo $(expr index "${username}" y) #查找y在指定字符的位置

#! /bin/basharr=(1 2 3 4 5)echo ${arr[0]} #输出1echo ${arr[1]} #输出2

#! /bin/basharr=(1 2 3 4 5)echo ${#arr[@]} #输出5echo ${#arr[*]}

#!/bin/basha="hello,world,nice,to,meet,you"#要将$a分割开，先存储旧的分隔符OLD_IFS="$IFS"#设置分隔符IFS="," #如下会自动分隔arr=($a)#恢复原来的分隔符IFS="$OLD_IFS"#遍历数组for s in ${arr[@]}doecho "$s"done