From the header:

# Quick and dirty utility to execute commands as the Apache user, use at your own risk!
# Useful if you do not have root access on a hosted server.
#
# To install:
# - copy qdexec to your twiki/bin directory
# - add qdexec to .htaccess to require authentication (like the edit script)
# - set $allowedUserName in the CONFIGURATION section below to the WikiName of the person
#   who is allowed to execute commands
#
# To use:
# - uncomment a ready made command temporarily (or create your own)
# - point your browser to http://your.server/cgi-bin/qdexec to execute the command
# - comment out the command immediately after use
#
# WARNING: For security, uncomment ready made commands only temporarily!

-- PeterThoeny - 01 Apr 2004