Once you have the basic Operating System Deployment process working with ConfigMgr 2007, you will likely want to begin customizing your task sequences. The Run Command Line action provides a very flexible method to add custom steps. There are a few things you should be aware of when developing Run Command Line steps.
You need to prepend "cmd.exe /c" to internal shell commands (these are commands which are implemented by cmd.exe, such as dir and mkdir, instead of external executables, such as xcopy.exe). Here is a list of the internal shell commands listed on Microsoft TechNet (http://www.microsoft.com/technet/archive/winntas/deploy/prodspecs/shellscr.mspx?mfr=true):
Batch files (.cmd and .bat) cannot run directly from a UNC path. This can be an issue if you advertise the task sequence with the "Access content directly from the distribution point" option.
Window PE is a stripped-down version of the full operating system and does not have all of the same tools available as a full version of Windows. You should verify that the Windows PE contains the binaries you require for your Run Command Line step.
The drive letters are not always what you might expect them to be when running in Windows PE. Whenever possible, use the variables set by ConfigMgr 2007, such as %OSDTargetDrive%, when you need to do things like access files on the local drive.
Contributed by Brett Flegg