How to tell if homebrew is installed on Mac OS X

Question

I am doing some Rails programming and I consistently see Homebrew referenced in solutions around the web but have never used it   I also notice Homebrew in the terminal version 2 9 as an option next to  Shell -  New  from the terminal drop down but when I select homebrew and issue commands  they fail    Usually with the  command not found  error   Strangely enough I have been unable to locate a simple command to determine whether brew is installed or not   How do I check to see if Homebrew is already installed on my Mac

User · Answer

I just type brew -v in terminal if you have it it will respond with the version number installed

User · Answer

In my case Mac OS High Sierra 10 13 6  brew -v  OutPut- Homebrew 2 2 2 Homebrew homebrew-core  git revision 71aa  last commit 2020-01-07  Homebrew homebrew-cask  git revision 84f00  last commit 2020-01-07

User · Answer

While which is the most common way of checking if a program is installed  it will tell you a program is installed ONLY if it s in the  PATH  So if your program is installed  but the  PATH wasn t updated for whatever reason   which will tell you the program isn t installed      One example scenario is changing from Bash to Zshell and    zshrc not having the old  PATH from    bash profile   command -v foo is a better alternative to which foo  command -v brew will output nothing if Homebrew is not installed  command -v brew   Here s a sample script to check if Homebrew is installed  install it if it isn t  update if it is   if      command -v brew            then     echo  Installing Hombrew       usr bin ruby -e    curl -fsSL https   raw githubusercontent com Homebrew install master install   else     echo  Updating Homebrew      brew update fi

User · Answer

The standard way of figuring out if something is installed is to use which   If Brew is installed    gt  gt  gt  which brew  usr local bin brew   If Brew is not installed    gt  gt  gt  which brew brew not found      Note  The  not installed  message depends on your shell  zsh is shown above  bash will just not print anything  csh will say brew  Command not found  In the  installed  case  all shells will print the path     It works with all command line programs  Try which grep or which python  Since it tells you the program that you re running  it s helpful when debugging as well

User · Answer

brew -v or brew --version does the trick

User · Answer

brew doctor checks if Homebrew is installed and working properly

User · Answer

I use this to perform update or install   which -s brew if          0      then       Install Homebrew     ruby -e    curl -fsSL https   raw githubusercontent com Homebrew install master install   else     brew update fi

User · Answer

Another one possible way     Check if Ninja is installed if   which ninja  gt   dev null then echo  Ninja installation     brew install ninja fi

User · Answer

Once you install Homebrew  type command brew doctor in terminal     If you get the following message       Your system is ready to brew    then you are good to go and you have successfully installed homebrew   If you get any warnings  you can try fixing it

User · Answer

brew help  If brew is there  you get output  If not  you get  command not found   If you need to check in a script  you can work out how to redirect output and check

User · Answer

use either the which or type built-in tools   i e   which brew or type brew

User · Answer

-f   which brew      amp  amp  echo  not installed    Explaination  If brew is not installed run command after  amp  amp

User · Answer

Running Catalina 10 15 4 I ran the permissions command below to get brew to install  sudo chown -R   whoami  admin  usr local    amp  amp  sudo chmod -R g rwx  usr local

[ruby-on-rails] How to tell if homebrew is installed on Mac OS X

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