linux字符串和数组

今天用了一下shell的数组和字符串，说实话，用完我的感觉是非常不舒服，尤其是数组，感觉用起来很不方便，和Python相比，简直是太low了。

我就对比一下shell和python吧。

#定义数组
a=(1 2 3)
#python: a = (1,2,3)

#数组长度
echo "${#a[@]}"
#  python: len(a)

#取元素
echo "${a[0]}"
# python : a[0]

#数组遍历
for var in ${a[@]}
do
 echo $var
done

#python
#for var in a:
# print var

 

字符串：

#!/bin/bash

string='adnhuihfdius'

echo $string

#length
echo ${#string}

echo "qiepian:${string:1:2}"

#get last ten eles
echo ${string: -10}

#set variable
echo ${string:-10}

#replace the 1st matched ele
echo ${string/h/w}

#replace all matched ele
echo ${string//h/w}

 

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