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I want to write code that reads a list of packages from an array and tells me whether the corresponding RPM is installed:

ARRAY=(
pkg-config
python
python-devel
python-libs
readline
renderproto
sqlite
tcl
tk
zlib
)

for i in `echo  ${ARRAY[@]}`
do
    rpm -q $i
done

This code doesn't work properly. I want the output to be ok rpm named foobar is installed or rpm named foobar is not installed.

How can I do this?

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1 Answer 1

up vote 1 down vote accepted

The command rpm appears to change its exit status depending on whether the queried package is installed, so it can be used by if:

for package in "${ARRAY[@]}"; do
    if rpm -q $package >/dev/null 2>/dev/null; then
       echo "Package $package is installed."
    else
       echo "Package $package is not installed."
    fi
done
share|improve this answer
    
Works fine,a suggestion only 2>&1 >/dev/null is better than two > > –  elbarna May 5 at 19:00

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