Running console commands from shell script

I am trying to run a Yii console command from a shell script. The problem is when I execute the command directly in the command line as follows:


php -q /site/htdocs/derjon-dev/code/wwwroot/protected/yiic Mailer sendEmail

the above code is executed correctly. However, as soon as I add this line of code in a shell script, then try to execute the shell script as follows:


./sendtest.sh

I receive the following error:


Error: Unknown action: systemEmail


Usage: /site/htdocs/protected/yiic mailer <action>

Actions:

    sendMail

    invitationEmail

    welcomeEmail

    emailShare

    systemEmail

Seems the systemEmail action is included in there, but when I execute from within a shell script, the system cannot seem to find this command.

Any idea what I maybe doing wrong?

Cheers!