shell老掉牙报错，为什么

shell老报错，为什么？
想做个类似于Makefile作用的shell脚本，当./comile.sh remove时可以删除除.c与.sh以外的所有文件，但为什么老出错，错误为：
./compile.sh: line 10: 在未预料的“(”附近出现语法错误
./compile.sh: line 10: `ls !(*.c|*.sh) | xargs rm'

代码为：

C/C++ code

#read -p "which files are what you want to compile? "case $# in    "1")        if [ "$1" == "remove" ]; then            ls !(*.c|*.sh) | xargs rm                        if [ "$?" == "0" ]; then                echo "remove successfully"            else                echo "remove failure"            fi        else            gcc -o ${1%.c} $1        fi        ;;    "2")        gcc -o ${1%.c} $1        gcc -o ${2%.c} $2        ;;    *)        echo "usage: $0 para1 [para2 ....]"        ;;esac