I found to my annoyance than when running a project which uses a shell command,
Hudson creates a hudson*sh file in the project workspace. This is not polite;
the user expects that the workspace contains just the checkout and build
products. Stray files can confuse scripts.

Shell/BatchFile call FilePath.createTempFile. At first I thought to just delete
this method and change e.g. Shell to say

File script = null;
// ...
script = File.createTempFile("hudson","sh");
script.deleteOnExit();
Writer w = new FileWriter(script);
// ...

But then I noticed the line

String[] cmd = new String[]

{ DESCRIPTOR.getShell(),"-xe",script.getRemote()}

;

I have never used slaves and so I do not know the significance of the remote
path here. Surely the hudson*sh file is not used from other machines? Can this
simply be written (with File script) as

String[] cmd = new String[]

{ DESCRIPTOR.getShell(),"-xe",script.getAbsolutePath()}

;

without breaking remote builds?