Shell中的数组

shell中的数组有增删改查的功能，但是增删改的功能很少用，查是最常用的，一般和for循环相结合

Last login: Wed Nov 25 17:24:29 2015 from 192.168.220.1
[root@lamp ~]# kobe=(k o b e)
[root@lamp ~]# echo ${#kobe(@)} 
-bash: ${#kobe(@)}: bad substitution
[root@lamp ~]# echo ${#kobe[@]} 
4
[root@lamp ~]# echo ${#kobe[*]} 
4
[root@lamp ~]# kobe[4]=k
[root@lamp ~]# echo ${#kobe[@]}
5
[root@lamp ~]# echo ${kobe[0]}  
k
[root@lamp ~]# echo ${kobe[1]} 
o
[root@lamp ~]# echo ${kobe[4]} 
k
[root@lamp ~]# kobe[0]=kk       
[root@lamp ~]# echo ${#kobe[@]}
5
[root@lamp ~]# echo ${kobe[0]}  
kk
[root@lamp ~]# unset kobe
[root@lamp ~]# echo $kobe     

[root@lamp ~]# kobe=(k o b e)   
[root@lamp ~]# unset ${kobe[0]}
[root@lamp ~]# echo $kobe
k
[root@lamp ~]# unset ${#kobe[*]} 
-bash: unset: `4': not a valid identifier
[root@lamp ~]# unset ${kobe[@]}  
[root@lamp ~]# kobe=(k o b e)   
[root@lamp ~]# unset ${kobe[0]}  
[root@lamp ~]# echo ${kobe[@]}
k o b e
[root@lamp ~]# echo kobe[@]   
kobe[@]
[root@lamp ~]# unset kobe[@]    
[root@lamp ~]# unset kobe[0] 
[root@lamp ~]# echo ${kobe[@]}

[root@lamp ~]# kobe=(k o b e)
[root@lamp ~]# unset ${kobe[@]}
[root@lamp ~]# echo ${kobe[@]}
k o b e
[root@lamp ~]# unset kobe[0]   
[root@lamp ~]# echo ${kobe[@]}
o b e
[root@lamp ~]# 

数组的应用

[root@lamp ~]# ls
EOF              install.log         robots.txt  test
anaconda-ks.cfg  install.log.syslog  tar.sh
[root@lamp ~]# file=($(ls)) 
[root@lamp ~]# echo ${file[@]}
EOF anaconda-ks.cfg install.log install.log.syslog robots.txt tar.sh test
[root@lamp ~]# echo ${#file[*]}
7
[root@lamp ~]# for((i=0;i<${#file[@]};i++));do echo ${file[$i]};done  
EOF
anaconda-ks.cfg
install.log
install.log.syslog
robots.txt
tar.sh
test
[root@lamp ~]# 
[root@lamp ~]# for n in ${file[@]};do echo $n;done    
EOF
anaconda-ks.cfg
install.log
install.log.syslog
robots.txt
tar.sh
test
[root@lamp ~]#