file reader java script code example

Example 1: java how to read file extension

private static String getFileExtension(File file) {
        String extension = "";
 
        try {
            if (file != null && file.exists()) {
                String name = file.getName();
                extension = name.substring(name.lastIndexOf("."));
            }
        } catch (Exception e) {
            extension = "";
        }
 
        return extension;
 
    }

Example 2: read file using shell script

#!/bin/bash
input="/path/to/txt/file"
while IFS= read -r line
do
  echo "$line"
done < "$input"