It is useful for hacking a large projects which contain many sub-directories, many It runs in UNIX (POSIX) compatible operating system, like GNU and BSD.
GNU GLOBAL is part of the GNU project, and is free software.
The tutorial book specified a particular build of Drush to install (7.0.0-alpha5).
I've navigated to a drupal folder and run Googling this error suggests this a problem with the version of Drush and to upgrade.
SO I've navigated into the .composer/vendor/drush/drush folder and run composer global update but composer says nothing to update, confirming the version as 7.0.0-alpha5 - I assume this is not the latest 7.x version, so do I need something changing in the file?
When the Inter-American Commission announces it has to cut its personnel by forty percent – and when States have already withdrawn from it and the Inter-American Court; When States Parties have threatened to withdraw from the Rome Statute of the International Criminal Court – and, even more recently, others threaten to leave the United Nations, or the European Court of Human Rights and the European Union; When those calling for departure have seemingly already fled in their minds from the urge to protect the world from the untold sorrow and miseries which twice swept it, and brought about the creation of many of these very institutions; When filthy abuse by politicians of the vulnerable is tolerated; when the laws – human rights law, refugee law, international humanitarian law – are increasingly violated, and when hospitals are bombed – but no one is punished; When human rights, the two words, are so rarely found in the world of finance and business, in its literature, in its lexicon – why? When working for the collective benefit of all people, everywhere is apparently losing its ardour, and features only in empty proclamations swelling with unjustified self-importance and selfishness – Then do we really still have an international community?Mr President, As I speak before this 32nd session of the Human Rights Council, at which all of the 193 Member States of the United Nations are represented, the international community's familiar customs and procedures are much in evidence.And yet the workable space in which we function as one community – resolving disputes, coming to consensus – is under attack.Check out drush's packagist page: https://packagist.org/packages/drush/drush That will show you the available release versions of drush. 2) It's best practice to install drush per project.The reasons why are a little complex and might not answer the question here, so I'll just link to an article: https://pantheon.io/blog/composer-vs-drush-make-which-should-you-use Thanks paul-m - editing that rather than the one inside drush/drush did the job, updated to 7.4 for now, which got rid of the error.