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Open source software is software whose source code is published and made available to the public, enabling anyone to copy, modify and redistribute the source code without paying royalties or fees. Open source code evolves through community cooperation. These communities are composed of individual programmers as well as very large companies.
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votes
How to upgrade Homebrew itself (not softwares/formulas installed by it) on macOS?
To update homebrew itself, use:
brew update
To upgrade all packages installed using homebrew, then you have to use brew upgrade. You can check this FAQ from brew website for more details.