Thread: Search for word and change complete line in file

I´m trying to make a java program that takes an argument as a variable. Then opens a file searches for a keyword and replaces the whole line with another.

for example as I would do it with the command sed -i "/OBSERVER/c OBSERVER 'argument' /DAY" hdu.tpl3

so I would look for the word OBSERVER in the file hdu.tpl3 and substitute the line with "OBSERVER 'argument' /DAY

This is the code a have and dosen´t change anything in the file

import java.io.*;
import java.util.regex.*;

public class FileTest {

public static void main(String[] args){

String name= "";
name = name + args[0];
String line= "sed -i";
line = line.concat(" \"/OBSERVER/c OBSERVER '");
line = line.concat(name);
line = line.concat("' /DAY \" hdu.tpl3");
String command = line;
System.out.println(command);

try{
Process process = Runtime.getRuntime().exec(command);
} catch (Exception e) {
System.out.println("Something went wrong.");
}
}

}