chore: complete cat tasks

Author: XiaoQuark

individual-shell-tools/cat/script-01.sh

@@ -4,3 +4,4 @@ set -euo pipefail
 
 # TODO: Write a command to output the contents of the helper-1.txt file inside the helper-files directory to the terminal.
 # The output of this command should be "Once upon a time...".
+cat ../helper-files/helper-1.txt

individual-shell-tools/cat/script-02.sh

@@ -11,3 +11,4 @@ set -euo pipefail
 # It looked delicious.
 # I was tempted to take a bite of it.
 # But this seemed like a bad idea...
+cat ../helper-files/*.txt

individual-shell-tools/cat/script-03.sh

@@ -9,3 +9,19 @@ set -euo pipefail
 # 1 It looked delicious.
 # 2 I was tempted to take a bite of it.
 # 3 But this seemed like a bad idea...
+cat -n ../helper-files/helper-3.txt
+
+#!/bin/bash
+
+set -euo pipefail
+
+# TODO: Write a command to output the contents of all of the files inside the helper-files directory to the terminal.
+# Make sure you are only calling `cat` once.
+#
+# The output of this command should be:
+# Once upon a time...
+# There was a house made of gingerbread.
+# It looked delicious.
+# I was tempted to take a bite of it.
+# But this seemed like a bad idea...
+cat ../helper-files/*.txt

individual-shell-tools/cat/script-04-stretch.sh

@@ -13,3 +13,4 @@ set -euo pipefail
 # 3 It looked delicious.
 # 4 I was tempted to take a bite of it.
 # 5 But this seemed like a bad idea...
+cat -n ../helper-files/*.txt