RPM Pre-Installation Checking Script

This is copied from sources over internet. A good example on how to write a script.

#!/bin/bash
# rpm−check.sh
# Queries an rpm file for description, listing, and whether it can be installed.
# Saves output to a file.
#
# This script illustrates using a code block.
SUCCESS=0
E_NOARGS=65
if [ −z "$1" ]
then
echo "Usage: `basename $0` rpm−file"
exit $E_NOARGS
fi
{
echo
echo "Archive Description:"
rpm −qpi $1 # Query description.
echo
echo "Archive Listing:"
rpm −qpl $1 # Query listing.
echo
rpm −i −−test $1 # Query whether rpm file can be installed.
if [ "$?" −eq $SUCCESS ]
then
echo "$1 can be installed."
else
echo "$1 cannot be installed."
fi
echo
} > "$1.test" # Redirects output of everything in block to file.
echo "Results of rpm test in file $1.test"
# See rpm man page for explanation of options.
exit 0
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