Bash：If语句嵌套在for循环中

Question

I am writing a simple script to check if an entered directory path exists. This is what I have

echo "Please specify complete directory path"
read file_path

for file in $file_path; do
    if [[ -d "$file" ]]; then
        echo "$file is a directory"
        break
    else
        echo "$file is not a directory, please try again."
fi
done

What I need is if it is not a directory to go back and ask for the file path again.

Thanks.

Answer 1

How about this?

echo "Please specify complete directory path"

while read file; do
    if [[ -d "$file" ]]; then
        echo "$file is a directory"
        break
    fi
    echo "$file is not a directory, please try again."
done

Answer 2

No need to split the path into its parts, testing the entire path with -d will tell you whether or not it is a directory. You need to put the entire test into a while loop until the user gets it right:

#/bin/sh
set -e
file_path=''
while [ ! -d "$file_path" ]
do
    echo "Please specify complete directory path"
    read file_path   
    if [ ! -d "$file_path" ]
    then
        echo "$file_path is not a directory, please try again."
    fi
done

I can use it like this

$ sh /tmp/test.sh 
Please specify complete directory path
foobar
foobar is not a directory, please try again.
Please specify complete directory path
/var/www