What is the difference between -f and -s options in If condition?

unix if-statement

From man test:

-f FILE          FILE exists and is a regular file-s FILE          FILE exists and has a size greater than zero

Let's create a file from scratch and check it out.

$ touch b

Does the file exist?

$ [ -f "b" ] && echo "file exists"file exists                          # yes!!!!

Does the file have a size greater than zero?

$ [ -s "b" ] && echo "file exists and is greater than zero"$                                    # no!!!!

So a good if-elif-else condition to check the existence of a file could be:

if [ -s "$file" ]; then   echo "exists and it is not empty"elif [ -f "$file" ]; then   echo "at least exists"else   echo "does not exist"fi

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