【shell-array】
Creating Array:
1 $ names=("Bob" "Peter" "$USER" "Big Bad John") 2 $ names=([0]="Bob" [1]="Peter" [20]="$USER" [21]="Big Bad John") 3 # or... 4 $ names[0]="Bob"
You can get the number of elements of an array by using ${#array[@]}:
1 $ array=(a b c) 2 $ echo ${#array[@]} 3 3
There is also a second form of expanding all array elements, which is "${arrayname[*]}". This form is ONLY useful for converting arrays into a single string with all the elements joined together. The main purpose for this is outputting the array to humans:
1 $ names=("Bob" "Peter" "$USER" "Big Bad John") 2 $ echo "Today's contestants are: ${names[*]}" 3 Today's contestants are: Bob Peter lhunath Big Bad John
Associative Arrays
To create an associative array, you need to declare it as such (using declare -A).
1 $ declare -A fullNames 2 $ fullNames=( ["lhunath"]="Maarten Billemont" ["greycat"]="Greg Wooledge" ) 3 $ echo "Current user is: $USER. Full name: ${fullNames[$USER]}." 4 Current user is: lhunath. Full name: Maarten Billemont.
参考:
1. http://hi.baidu.com/gaogaf/item/46050b15958a5225f7625c4a
2. http://www.cnblogs.com/chengmo/archive/2010/09/30/1839632.html
3. http://bash.cumulonim.biz/BashGuide(2f)Arrays.html
