Shell scripts to check if certain dpkg packages are installed on linux systems.

npm.sh

#!/bin/bash

## npm
is_npm_installed=$(dpkg -l | grep -i npm | awk '{print $2}')
if [ '$is_npm_installed' == 'npm' ]
 then
        is_npm_installed=true
else
        is_npm_installed=false
fi

echo npm is installed $is_npm_installed