shell 嵌套条件语句时，尽量把靠近两次判断

最新推荐文章于 2024-06-21 17:35:08 发布

claider

最新推荐文章于 2024-06-21 17:35:08 发布

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分类专栏： Unix 文章标签： shell branch freebsd input

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if [ $# != 2 ]
then
if [ $1 = "h" -o $1 = "H" ]
then
echo "help info"
else
echo "ERROR: Invalid argument amount! Plz input 2 directory names!"
fi
echo "**************************************************************"
echo "* by Richard Zhang, Oct, 2008. *"
echo "* China Contruction Bank, SuZhou Branch *"
echo "* Usage example: 'sh $0 <dir1> <dir2>' *"
echo "* for help: 'sh $0 h' *"
echo "**************************************************************"
exit 0
fi

没有问题，但是，如果
if [ $# != 2 ]
then
echo "**************************************************************"
echo "* by Richard Zhang, Oct, 2008. *"
echo "* China Contruction Bank, SuZhou Branch *"
echo "* Usage example: 'sh $0 <dir1> <dir2>' *"
echo "* for help: 'sh $0 h' *"
echo "**************************************************************"
if [ $1 = "h" -o $1 = "H" ]
then
echo "help info"
else
echo "ERROR: Invalid argument amount! Plz input 2 directory names!"
fi

exit 0
fi

则在FreeBSD6.1下运行时，提示“[: =: unexpected operator”
真实奇怪。