This is a java program to implement grep linux command.
Here is the source code of the Java Program to Implement the Program Used in grep/egrep/fgrep. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.
package com.sanfoundry.setandstring;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class GrepCommandImplementation
{
public static void main(String[] argv) throws Exception
{
Scanner sc = new Scanner(System.in);
System.out
.println("Enter the string to match from GrepCommandImplementation.java file: ");
Pattern pattern = Pattern.compile(sc.next());
Matcher matcher = pattern.matcher("");
String file = "src/com/sanfoundry/setandstring/GrepCommandImplementation.java";
BufferedReader br = null;
String line;
try
{
br = new BufferedReader(new FileReader(file));
}
catch (IOException e)
{
System.err.println("Cannot read '" + file + "': " + e.getMessage());
}
while ((line = br.readLine()) != null)
{
matcher.reset(line);
if (matcher.find())
{
System.out.println(file + ": " + line);
}
}
br.close();
sc.close();
}
}
Output:
$ javac GrepCommandImplementation.java $ java GrepCommandImplementation Enter the string to match from GrepCommandImplementation.java file: println src/com/sanfoundry/setandstring/GrepCommandImplementation.java: .println("Enter the string to match from GrepCommandImplementation.java file: "); src/com/sanfoundry/setandstring/GrepCommandImplementation.java: System.err.println("Cannot read '" + file + "': " + e.getMessage()); src/com/sanfoundry/setandstring/GrepCommandImplementation.java: System.out.println(file + ": " + line);
Sanfoundry Global Education & Learning Series – 1000 Java Programs.
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