Question

【shell脚本】 该脚本是用来新建一个目录，要传入一个参数，sh ifmkdir.sh 123 运行后 提示语法错误

脚本：
#!/bin/sh
dd=$1
if [ "$dd" = "" ];then
echo "you did not input anything!"
exit 1
fi
if [ -d $dd ]
then :
else
echo "the directory is exist!"
echo -n "do you create it now [y..n]?"
read mm
if [ "$mm" = "y" ] || [ "$mm" = "Y" ]
then
echo " create it now!"
mkdir $dd
if [ $? != 0 ]
then
echo " it is not OK!"
exit 1
else :
fi
运行： sh ifmkdir.sh 123
运行错误：

Answer 1

修改了下，你看看是否可以运行了：
#!/bin/sh
dd=$1
if [ "$dd" = "" ];then
echo "you did not input anything!"
exit 1
fi
if [ -d $dd ]
then
echo "the directory is exist!" <-- 这句按语义该在if分支
exit 1 <-- 这边加个exit好点
else
echo -n "do you create it now [y..n]?"
fi <-- 这边少加了fi，初学者常见错误
read mm
if [ "$mm" = "y" ] || [ "$mm" = "Y" ]
then
echo " create it now!"
mkdir $dd
fi <-- 同上
if [ $? != 0 ]
then
echo " it is not OK!"
exit 1
else
:
fi