Answer is added for challenge called 'Grep #3'.

Author: xChivalrouSx

Diff for: linux-shell/00053_HackerrankLinuxShell.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# 'Grep' #3
+# https://www.hackerrank.com/challenges/text-processing-in-linux-the-grep-command-3/problem?isFullScreen=true
+
+grep -wiv that