Barry Marler said, 

>> What is the quickest (or preferred) way of checking (in a
>> bash script) if a given package is installed?

> 2. qpkg -I <package name>

qpkg returns zero whether the package is installed or not.

You could use something like

    if [ `qpkg -I packagename | wc -l` -gt 0 ]; then
        echo "installed"
    else
        echo "not installed"
        fi


Cheers

Neil
-- 
"God created the world in six days.  On the seventh day he also decided to create 
England...
just to try out his Practical Joke Weather Machine."


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