java - readLine

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;

public class CommandExtractor {
	
	public static void main(String[] args) throws Exception {
		File file = new File(args[0]);
		if(file.exists())
		{
		    BufferedReader inFile = new BufferedReader(new InputStreamReader(new FileInputStream(file),"UTF-8"));
		    String sLine = null;
		    while( (sLine = inFile.readLine()) != null )
		    {
		    	if (sLine.indexOf("command") > 0) {
		    		System.out.println(sLine.substring(57));
		    	}
		    }
		}
	}
}