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#!/usr/bin/perl -w
`cd test_dir`
`gunzip test_script.tar.gz`
`tar -xvf test_script.tar`
#you are getting the idea now

# we enter here with a hostname $host and must look it up
# in a file containing details for >100K hosts
...
}
# needles to say %hash was global, well everything was 
# and %hash used again