Shell Script - Install RPM

#!/bin/bash 

# @(#) user1    Demonstrate rpm query.

uname -rv

bash --version

rpm --version

echo

P=${1?" must specify package name."}

rpm -qa "$P" > t1

my_size=$( wc -l < t1 )

echo " Size of report file is $my_size lines"

if [[ $( rpm -qa $P ) =~ ${P} ]]

# if [[ $( rpm -qa $P ) == *${P}* ]]

then

  echo " Package $P is installed."

else

  echo " Package $P not found."

fi

exit 0