declare -a array
(其實不用聲明,按數組方式直接賦值給變量即可,BASH就知道那是數組)
(1) array=(var1 var2 var3 ... varN)
(2) array=([0]=var1 [1]=var2 [2]=var3 ... [n]=varN)
(3) array[0]=var1
arrya[1]=var2
...
array[n]=varN
計算數組元素個數:
${#array[@]} 或者 ${#array[*]}
echo ${array[n]}
filename=(`ls`)
for var in ${filename[@]};do
echo $var
done
n=5
while [ "$i" -lt $n ] ; do
echo "Please input strings ... `expr $i + 1`"
read array[$i]
b=${array[$i]}
echo "$b"
i=`expr $i + 1`
done
chars='abcdefghijklmnopqrstuvwxyz'
for (( i=0; i<26; i++ )) ; do
array[$i]=${chars:$i:1}
echo ${array[$i]}
done
bcd
...
vxy
xyz
yz //沒有足夠字符串獲取了
z //沒有足夠字符串獲取了
重新賦值:(原來的值被重寫)
[root@pps ~]# SEASON=("Spring" "Summer" "Autumn" "Winter")
[root@pps ~]# set | grep SEASON
SEASON=([0]="Spring" [1]="Summer" [2]="Autumn" [3]="Winter")
[root@pps ~]# echo ${SEASON[*]} 或者 echo ${SEASON[@]}
Spring Summer Autumn Winter
[root@pps ~]# echo ${SEASON[3]}
Winter
[root@pps ~]# SEASON[0]="New_Spring"
[root@pps ~]# echo ${SEASON[*]}
New_Spring Summer Autumn Winter
[root@pps ~]# unset SEASON[2]
[root@pps ~]# unset SEASON
[root@pps ~]# cat /etc/shells | tr "\n" " " > /tmp/tmp.file
[root@pps ~]# read -a SHELLS < /tmp/tmp.file
[root@pps ~]# set | grep "SHELLS"
SHELLS=([0]="/bin/sh" [1]="/bin/bash" [2]="/sbin/nologin" [3]="/bin/tcsh" [4]="/bin/csh" [5]="/bin/ksh")