I was installing this Composer package called ibis which is a PHP tool that helps you write eBooks in markdown. Now, the package should be installed globally, so I ran the following command. $ composer global require themsaid/ibis To check whether the package is installed or not, I ran the following command. $ ibis --help But, I got the following error. fish: Command 'ibis' not found I was like, what the hell? I just installed the package globally. So, it should be available in the shell righ...