$* 和 $@ 都表示传递给函数或脚本的所有参数,不被双引号(" ")包含时,都以"$1" "$2" … "$n" 的形式输出所有参数。
但是当它们被双引号(" ")包含时,"$*" 会将所有的参数作为一个整体,以"$1 $2 … $n"的形式输出所有参数;"$@" 会将各个参数分开,以"$1" "$2" … "$n" 的形式输出所有参数。
下面的例子可以清楚的看到 $* 和 $@ 的区别:

 1 #!/bin/bash
 2 echo "\$*=" $*
 3 echo "\"\$*\"=" "$*"
 4 
 5 echo "\$@=" $@
 6 echo "\"\$@\"=" "$@"
 7 
 8 echo "print each param from \$*"
 9 for var in $*
10 do
11     echo "$var"
12 done
13 
14 echo "print each param from \$@"
15 for var in $@
16 do
17     echo "$var"
18 done
19 
20 echo "print each param from \"\$*\""
21 for var in "$*"
22 do
23     echo "$var"
24 done
25 
26 echo "print each param from \"\$@\""
27 for var in "$@"
28 do
29     echo "$var"
30 done

执行 sh test "a" "b" "c" "d",看到下面的结果: