Ensure proper exit codes for each shell script

Author: flavioheleno

build_html.sh

@@ -1,2 +1,9 @@
+#!/usr/bin/env bash
+
+# https://sipb.mit.edu/doc/safe-shell/
+set -eufo pipefail
+
+shopt -s failglob
+
 sphinx-build -b html -d doctrees Book BookHTML
 php generate_php5_redirects.php

build_release_html.sh

@@ -1,3 +1,10 @@
+#!/usr/bin/env bash
+
+# https://sipb.mit.edu/doc/safe-shell/
+set -eufo pipefail
+
+shopt -s failglob
+
 # get rid of old files, so we don't keep them around in the git repo
 # when a file or directory was renamed
 rm -rf BookHTML/*/

build_release_latex.sh

@@ -1,3 +1,10 @@
+#!/usr/bin/env bash
+
+# https://sipb.mit.edu/doc/safe-shell/
+set -eufo pipefail
+
+shopt -s failglob
+
 rm -rf BookLatex
 # inkscape Book/hashtables/images/basic_hashtable.svg -D -A Book/hashtables/images/basic_hashtable.pdf
 # inkscape Book/hashtables/images/doubly_linked_hashtable.svg -D -A Book/hashtables/images/doubly_linked_hashtable.pdf