How to use Shell to determine if a file exists?

In a shell script, you can use the -f option to determine if a file exists. An example is shown below:

#!/bin/bash

file_path="/path/to/your/file"

if [ -f "$file_path" ]; then
    echo "File exists"
else
    echo "File does not exist"
fi

In the example above, the file path is first defined and then the -f option is used to check if the file exists. If the file exists, it will output “File exists”, otherwise it will output “File does not exist”.