創建一個名爲/root/foo.sh 的腳本，讓其提供下列特性： 當運行/root/foo.sh redhat，輸出爲 fedora 當運行/root/foo.sh fedora，輸出爲 redhat 當沒有任何參數或者參數不是 redhat 或者 fedora 時，其錯誤輸出產生以下的信息：/root/foo.sh redhat|fedora
[root@serverX ~]# vim /root/foo.sh
#!/bin/bash
if [ "$1" = "redhat" ]
then
echo "fedora"
elif [ "$1" = "fedora" ]
then
echo "redhat"
else
echo "/root/foo.sh redhat|fedora" >&2
fi
[root@serverX ~]# chmod +x /root/foo.sh
或者
[root@serverX ~]# vim /root/foo.sh
#!/bin/bash
case "$1" in
redhat)
echo "fedora"
;;
fedora)
echo "redhat"
;;
*)
echo '/root/foo.sh redhat|fedora' >&2
esac
[root@serverX ~]# chmod +x /root/foo.sh