Using launchctl command within a shell script

I have successfully installed two daemons, and I would like to be able to disable and enable them via shell scripts, called by the daemons themselves. Here is my first shell script:
#!/bin/sh
# Testing for presence of a CODEBOY file
if [ -e "/Volumes/CODEBOY/Change.txt" ]
then
osascript '/Users/praxisii/Library/Scripts/MacScript.scpt'
launchctl unload -w '/Users/praxisii/Library/LaunchDaemons/WaitDaemon.plist'
launchctl load -w '/Users/praxisii/Library/LaunchDaemons/RunDaemon.plist'
fi
The daemon works just fine, running the background, calling this script, which is waiting for me to plug in my flash drive (entitled CODEBOY). When the flash is plugged in, the applescript is called, and the first launchctl command is executed, which disables the WaitDaemon. As advertised, the .plist file is re-written with the Disabled key set to true. The next line (which is supposed to enable the RunDaemon) is never executed.
Similarly, if the launchctl line is placed before the osascript line, the applescript is never called. It is as if the shell ignores everything after a single launchctl command, which it will execute.
Any ideas or comments?

Gary:
Thank you for the link to the TN2083. Long, but very informative.
I appreciate all the other comments on this thread. I am an amateur AppleScript/UNIX scripter, and any opportunity to learn more is much appreciated.
I have completely re-worked my original launchd agent system for automatic processing of a file on a flash drive. Here is the .plist file that I now use:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>RunOSAscript</string>
<key>LowPriorityIO</key>
<true/>
<key>Program</key>
<string>/usr/bin/osascript</string>
<key>ProgramArguments</key>
<array>
<string>osascript</string>
<string>/Users/casdvm/Desktop/AutoFlash.scpt</string>
</array>
<key>RunAtLoad</key>
<false/>
<key>ServiceDescription</key>
<string>Runs Applescript directly</string>
<key>StandardOutPath</key>
<string>/Users/casdvm/Desktop/AutoFlashLog.txt</string>
<key>StartInterval</key>
<integer>25</integer>
</dict>
</plist>
The AutoFlash.scpt is an Applescript that simply uses the Finder to check for the presence of a specific file on the flash drive. If it is there, and a certain script property has a value of 2, then it runs the AppleScript that processes the desired file on the flash drive. Once that is done, the script property is set to 0 (to prevent the processing from happening over and over again.). Once the flash drive is removed, the script property is set back to 2 in anticipation of the next time the flash drive is plugged in.
It is much simpler than the two agents I was messing with beforehand. I did indeed discover that this .plist needs to be saved in the LaunchAgents folder of my user Library (thanks again for pointing that out, Gary).
The only problem that I have involves the continuous calling of the Applescript from the launchd agent. As you can see from my .plist file, that AppleScript is called every 25 seconds. I tried setting it up using the OnDemand key, but I kept receiving a re-spooling error of some sort (I don't recall exactly; my notes are sketchy on that phase of testing), so I just decided to have it go every 25 seconds. It really doesn't matter, since I can leave the flash drive plugged in all day anyway, and it only processes the desired file once.
Thanks again for all the commentary and discussion; I am grateful for the assistance.
Craig Smith

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