shell变量常用方法

#直接赋值
[root@local-yum yum.repos.d]# name[0]=chengd
[root@local-yum yum.repos.d]# name[1]=xrd
[root@local-yum yum.repos.d]# name[2]=cxx
#小括号赋值
[root@local-yum yum.repos.d]# age=(20 19 18)
#遍历数组变量
[root@local-yum yum.repos.d]# for i in ${name[@]};do echo $i ;done
chengd
xrd
cxx
[root@local-yum yum.repos.d]# for i in ${age[@]};do echo $i ;done
20
19
18
#获取数组长度
[root@local-yum yum.repos.d]# echo ${#name[@]}
3
[root@local-yum yum.repos.d]# echo ${#age[*]}
3
#删除数组元素
[root@local-yum yum.repos.d]# unset name[1]
[root@local-yum yum.repos.d]# echo ${#name[@]}
2
[root@local-yum yum.repos.d]# for i in ${name[@]};do echo $i ;done
chengd
cxx
#删除数组
[root@local-yum yum.repos.d]# unset name
[root@local-yum yum.repos.d]# echo ${#name[@]}
0
[root@local-yum yum.repos.d]# for i in ${name[@]};do echo $i ;done