bash check if package is installed
REQUIRED_PKG="some-package"
PKG_OK=$(dpkg-query -W --showformat='${Status}n' $REQUIRED_PKG|grep "install ok installed")
echo Checking for $REQUIRED_PKG: $PKG_OK
if [ "" = "$PKG_OK" ]; then
echo "No $REQUIRED_PKG. Setting up $REQUIRED_PKG."
sudo apt-get --yes install $REQUIRED_PKG
fihow to check installed packages in linux command
dpkg-query --list | grep -i nano
ii nano 2.9.3-2 amd64 small, friendly text editor inspired by PicoCopyright © 2021 Codeinu
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