import java.io.*;public class grep{	public static void main(String [] args) throws IOException{		if(args.length<1){			System.out.println("zu wenige Parameter");			throw new IllegalArgumentException("zu wenig Parameter!");		}		boolean reversed =false;		String pattern;		String sfile ="";		try{		if(args[0].equals("-v")){			reversed = true;			pattern =args[1];			if(args.length>2){				sfile = args[2];			}		}else{			pattern = args[0];			if(args.length==2){				sfile = args[1];			}		}		}catch(IndexOutOfBoundsException ex){			System.out.println("Irgendwas ist beim verarbeiten der Parameter schiefgegangen: " + ex);			return;		}		if (!(sfile.equals(""))){			File myfile;			try{				myfile = new File(sfile);			}catch(NullPointerException ex){				System.out.println("uhhps das sollte nicht passieren: " + ex);				return;			}			BufferedReader myreader;			try{			myreader = new BufferedReader(new FileReader(myfile));			}catch(FileNotFoundException ex){				System.out.println("File Not Found: " + ex);				return;			}			search(myreader, reversed, pattern);		}else{			BufferedReader myreader = new BufferedReader(new InputStreamReader(System.in));			try{				search(myreader, reversed, pattern);			}catch(IOException ex){				System.out.println("IO Fehler: " +ex);			}		}	}	private static void search(BufferedReader myreader, boolean reversed, String pattern) throws IOException{		//System.out.println("Suche nach: " + pattern);		while(myreader.ready()){			String sline = myreader.readLine();			if (reversed){				if(!sline.contains(pattern)){					System.out.println(sline);				}			}else{				if (sline.contains(pattern)){					System.out.println(sline);				}			}		}	}}