BASH: Checking for installed RPM

[eur0dad]

Within a bash script, how can I determine if an RPM is installed? I could parse the output of running the "rpm -q <package" command, but I don't know how to get the output into a variable or something. I don't really wanna' have to send it to a file, and read it.

[ghostdog74]

you could check for return values

# rpm -q test
package test is not installed
# echo $?
1
# rpm -q coreutils
coreutils-5.93-20
# echo $?
0

or you could grep "not installed"
if you want to put into variable:

# var=`rpm -q coreutils`
# echo $var
coreutils-5.93-20
 # var=`rpm -q test`
# echo $var
package test is not installed