Add grep program

src/Grep/Grep.java

+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Grep {
+    List<String> cmd = new ArrayList<>();
+    public Grep(String input) {
+        String cmd = "grep --color=always -w \"" + input + "\" GrepTest/test.rtf";
+        this.cmd.add("/bin/sh");
+        this.cmd.add("-c");
+        this.cmd.add(cmd);
+    }
+
+    public List<String> run_cmd() throws IOException {
+//        Runtime runtime = Runtime.getRuntime();
+//        Process process = runtime.exec(this.cmd);
+        ProcessBuilder prc_builder = new ProcessBuilder(cmd);
+        Process process = prc_builder.start();
+        BufferedReader input = new BufferedReader
+                              (new InputStreamReader(process.getInputStream()));
+        String line;
+        List<String> res = new ArrayList<>();
+
+        System.out.println("Start reading logs!");
+
+        //Fix this to return count of line matches
+        while ((line = input.readLine()) != null) {
+            System.out.println(line);
+            res.add(line);
+        }
+
+        System.out.println("End file!");
+        System.out.println("-----------------------------");
+        return res;
+    }
+}

src/Grep/GrepTest/test.rtf

+{\rtf1\ansi\ansicpg1252\cocoartf2638
+\cocoatextscaling0\cocoaplatform0{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
+{\colortbl;\red255\green255\blue255;}
+{\*\expandedcolortbl;;}
+\margl1440\margr1440\vieww11520\viewh8400\viewkind0
+\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
+
+Error: This is error 1 in log file
+
+Error: This is error 2 in log file
+
+Error: This is error 3 in log file
+}
\ No newline at end of file

src/Grep/GrepTest/test_1.rtf

+{\rtf1\ansi\ansicpg1252\cocoartf2638
+\cocoatextscaling0\cocoaplatform0{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
+{\colortbl;\red255\green255\blue255;}
+{\*\expandedcolortbl;;}
+\margl1440\margr1440\vieww11520\viewh8400\viewkind0
+\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
+
+\f0\fs24 \cf0 Error: This is an error for multi test case 1\
+}
\ No newline at end of file

src/Grep/GrepTest/test_2.rtf

+{\rtf1\ansi\ansicpg1252\cocoartf2638
+\cocoatextscaling0\cocoaplatform0{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
+{\colortbl;\red255\green255\blue255;}
+{\*\expandedcolortbl;;}
+\margl1440\margr1440\vieww11520\viewh8400\viewkind0
+\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
+
+\f0\fs24 \cf0 Error: This is a confirm for multi test case 2\
+!}
\ No newline at end of file

src/Grep/main.java

+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
+public class main {
+    public static void main (String args[]) throws IOException {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Input regex matching for grep command: ");
+        String input = sc.nextLine();
+        List<String> output = new ArrayList<>();
+
+        Grep grep = new Grep(input);
+        output = grep.run_cmd();
+
+        //Fix this to return count of line mmatches
+//        for (int i=0; i<output.size(); i++) {
+//            System.out.println(output.get(i));
+//        }
+    }
+
+}