Upload files to "OS/bash/Week4"

Signed-off-by: Aadit Agrawal <tech@aaditagrawal.com>

OS/bash/Week4/q5.sh

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+#!/bin/bash
+
+num_patterns=$(( $# ))
+patterns=("${@:1:num_patterns}")
+input_file="${!num_patterns}"
+
+
+while true;do
+    echo "a. Search the patterns in the given input file."
+    echo "b. Delete all occurrences of the pattern in the given input file."
+    echo "c. Exit"
+
+    read choice
+
+    case "$choice" in
+        a)
+            echo "Searching patterns in $input_file:"
+            for pattern in "${patterns[@]}"; do
+                grep "$pattern" "$input_file"
+            done
+            ;;
+        b)
+            echo "Deleting occurrences of patterns in $input_file:"
+            for pattern in "${patterns[@]}"; do
+                sed -i "s/$pattern//g" "$input_file"
+            done
+            echo "Occurrences deleted."
+            ;;
+        c)
+            echo "Exiting..."
+            exit 0
+            ;;
+        *)
+            echo "Invalid choice. Please enter 'a', 'b', or 'c'."
+            ;;
+    esac
+
+done