I would like to check the file existence using shell script. I used below code. If I have TEST.png or test.png, for both the file names if condition is succeeding and printing File found. But I would like to enable case sensitivity for file check. Please let me know how to enable case sensitivity in shell script.
file="/mnt/floppy/test.png"
if [ -f "$file" ]
then
echo "File found"
else
echo "Invalid file"
fi
Take a look at VFAT's case sensitivity mount options:
check=s: strict, case sensitive
check=r: relaxed, case insensitive
check=n: normal, default setting, currently case insensitive
Source: https://www.kernel.org/doc/Documentation/filesystems/vfat.txt
You can use grep:
file="/mnt/floppy/test.png"
echo $file | grep [A-Z] && echo "Invalid file: Filename has uppercase letters" && exit 1
# echo file | grep [a-z] && echo "Valid file"
[[:upper:]] and [[:lower:]] instead of [A-Z] and [a-z].
case $file in *[A-Z]*) echo Uppercase;; esac -- but the question seems to be about finding whether a file exists, regardless of case variations in the file name in the variable, which is a rather harder problem.