diff --git a/aliases/misc.aliases.sh b/aliases/misc.aliases.sh
index 0536abf..077c2fe 100644
--- a/aliases/misc.aliases.sh
+++ b/aliases/misc.aliases.sh
@@ -1,6 +1,12 @@
 #! bash oh-my-bash.module
-#  ---------------------------------------------------------------------------
+#------------------------------------------------------------------------------
+# Note on copyright (2022-08-23): The aliases defined in this file seems to
+# originally come from a blog post [1].  See also the comments in lib/base.sh.
 #
+# [1] Nathaniel Landau, "My Mac OSX Bash Profile",
+#     https://natelandau.com/my-mac-osx-bash_profile/, 2013-07-02.
+#
+#------------------------------------------------------------------------------
 #  Description:  This file holds many useful BASH aliases and save our lives!
 #
 #  Sections:
@@ -15,7 +21,7 @@
 #
 #  X.   Reminders & Notes
 #
-#  ---------------------------------------------------------------------------
+#------------------------------------------------------------------------------
 
 #   -------------------------------
 #   1.  FILE AND FOLDER MANAGEMENT
@@ -63,21 +69,23 @@ alias qfind="find . -name "                 # qfind:    Quickly search for file
 #   4.  NETWORKING
 #   ---------------------------
 
-alias netCons='lsof -i'                                   # netCons:      Show all open TCP/IP sockets
-alias lsock='sudo /usr/sbin/lsof -i -P'                   # lsock:        Display open sockets
-alias lsockU='sudo /usr/sbin/lsof -nP | grep UDP'         # lsockU:       Display only open UDP sockets
-alias lsockT='sudo /usr/sbin/lsof -nP | grep TCP'         # lsockT:       Display only open TCP sockets
-alias ipInfo0='ifconfig getpacket en0'                    # ipInfo0:      Get info on connections for en0
-alias ipInfo1='ifconfig getpacket en1'                    # ipInfo1:      Get info on connections for en1
-alias openPorts='sudo lsof -i | grep LISTEN'              # openPorts:    All listening connections
-alias showBlocked='sudo ipfw list'                        # showBlocked:  All ipfw rules inc/ blocked IPs
+alias netCons='lsof -i'                         # netCons:      Show all open TCP/IP sockets
+alias lsock='sudo lsof -i -P'                   # lsock:        Display open sockets
+alias lsockU='sudo lsof -nP | grep UDP'         # lsockU:       Display only open UDP sockets
+alias lsockT='sudo lsof -nP | grep TCP'         # lsockT:       Display only open TCP sockets
+alias openPorts='sudo lsof -i | grep LISTEN'    # openPorts:    All listening connections
+alias showBlocked='sudo ipfw list'              # showBlocked:  All ipfw rules inc/ blocked IPs
+if _omb_util_binary_exists ifconfig; then
+  alias ipInfo0='ifconfig getpacket en0'          # ipInfo0:      Get info on connections for en0
+  alias ipInfo1='ifconfig getpacket en1'          # ipInfo1:      Get info on connections for en1
+fi
 
 
 #   ---------------------------------------
 #   5.  SYSTEMS OPERATIONS & INFORMATION
 #   ---------------------------------------
 
-alias mountReadWrite='/sbin/mount -uw /'    # mountReadWrite:   For use when booted into single-user
+alias mountReadWrite='mount -uw /'    # mountReadWrite:   For use when booted into single-user
 
 
 #   ---------------------------------------
@@ -101,11 +109,14 @@ alias weeknum='date +%V'
 #   8.  WEB DEVELOPMENT
 #   ---------------------------------------
 
-alias apacheEdit='sudo edit /etc/httpd/httpd.conf'      # apacheEdit:       Edit httpd.conf
-alias apacheRestart='sudo apachectl graceful'           # apacheRestart:    Restart Apache
 alias editHosts='sudo edit /etc/hosts'                  # editHosts:        Edit /etc/hosts file
-alias herr='tail /var/log/httpd/error_log'              # herr:             Tails HTTP error logs
-alias apacheLogs="less +F /var/log/apache2/error_log"   # Apachelogs:       Shows apache error logs
+
+if _omb_util_binary_exists apachectl; then
+  alias apacheEdit='sudo edit /etc/httpd/httpd.conf'      # apacheEdit:       Edit httpd.conf
+  alias apacheRestart='sudo apachectl graceful'           # apacheRestart:    Restart Apache
+  alias herr='tail /var/log/httpd/error_log'              # herr:             Tails HTTP error logs
+  alias apacheLogs="less +F /var/log/apache2/error_log"   # Apachelogs:       Shows apache error logs
+fi
 
 #   ---------------------------------------
 #   9.  OTHER ALIASES
diff --git a/lib/bourne-shell.sh b/lib/bourne-shell.sh
index c45e2f8..cd3fcac 100644
--- a/lib/bourne-shell.sh
+++ b/lib/bourne-shell.sh
@@ -74,7 +74,9 @@ fi
 
 # Add an "alert" alias for long running commands.  Use like so:
 #   sleep 10; alert
-_omb_util_alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//'\'')"'
+if _omb_util_binary_exists notify-send; then
+  _omb_util_alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//'\'')"'
+fi
 
 # Alias definitions.
 # You may want to put all your additions into a separate file like