===================¨
#!/bin/sh
/path/to/actual/program_to_run
===================

Just the part between the lines with =='s. #!/bin/sh must be on first line of file.
Be sure to save it it with Unix style line endings, if creating it on a non-unix system, or it will not work (use something like UltraEdit on Windows).

Save that in the preinit.d catalog with an appropriate name and keep the real programs somewhere else. Don't forget to make it executeable.

/Michael
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/Michael