Detect if homebrew package is installed

Question

I\'m about to write a shell script to detect if several homebrew packages are installed in the system. Is there a way to use a brew command to achieve that?

I tried usin

Answer 1

What about?

for pkg in macvim ngrep other needed packages; do
    if brew list -1 | grep -q "^${pkg}\$"; then
        echo "Package '$pkg' is installed"
    else
        echo "Package '$pkg' is not installed"
    fi
done