Detect if homebrew package is installed
# install if we haven't installed any version
brew ls --versions $lib || brew install $lib
# install if we haven't installed latest version
brew outdated $lib || brew install $lib
You can use
brew ls --versions myformula
to output the installed versions of the respective formula. If the formula is not installed, the output will be empty.
When using a recent versions of homebrew, which you can get with brew update
, you can just run this (thanks Slaven):
if brew ls --versions myformula > /dev/null; then
# The package is installed
else
# The package is not installed
fi
That said, it is probably a good idea to check for the existence of the tool at all and not just checking for the respective homebrew package (e.g. by searching for the executable in the $PATH
). People tend to install tools in a rather large amount of ways in practice, with homebrew being just one of them.
What about?
for pkg in macvim ngrep other needed packages; do
if brew list -1 | grep -q "^${pkg}\$"; then
echo "Package '$pkg' is installed"
else
echo "Package '$pkg' is not installed"
fi
done