small loop unix with user input - loops

Question

I want to cat the lines of a csv file using "cat ~/Desktop/file.csv" in a loop using an input user path and when I execute this command in the terminal it works but not with the loop.
When I execute this script it works perfect :
for line in $(cat ~/Desktop/file.csv);
do echo $line;
done
I execute a small script in my desk by clicking on an icon : algo.command and I enter this path : ~/Desktop/file.csv
my script is :
read -p "Enter the path of your file :" path
for line in $(cat "$path");
do echo $line;
done
and I have this output :
cat: ~/Desktop/file.csv: No such file or directory
[Process completed]
Thank you for your help

Answer 1

The ~ is not replaced by /home/<your login name> as you expected because you read a string and you get it as it is, the shell does not interpret it like in your working case.
You have to give the path without using ~ except if you do the substitution in the script by yourself :
If your script is executed by bash :
read -p "Enter the path of your file :" path
if [ ${path:0:2} = "~/" ]
then
path=${path/\~/$HOME}
elif [ ${path:0:1} = "~" ]
then
# suppose ~<user name>
path=${path/\~/\/home\/}
fi
for line in $(cat "$path");
do echo $line;
done
Example having that script in /tmp/s
pi#raspberrypi:/tmp $ echo ~
/home/pi
pi#raspberrypi:/tmp $ (echo aze ; echo qsd) > ~/aze
pi#raspberrypi:/tmp $ cat ~/aze
aze
qsd
pi#raspberrypi:/tmp $ bash s
Enter the path of your file :~/aze
aze
qsd
pi#raspberrypi:/tmp $ bash s
Enter the path of your file :~pi/aze
aze
qsd
pi#raspberrypi:/tmp $ cd
pi#raspberrypi:~ $ bash /tmp/s
Enter the path of your file :aze
aze
qsd
pi#raspberrypi:~ $