merge pages on pdf preview mac os x el capitan 10.11.6

If you use your Mac for things like on-line banking or internet shopping then you may want to reconsider using developer tools and unverified software on the same machine. Since you are new to this it is worth mentioning that installing Homebrew effectively allows you to bypass macOS security and though this does not necessarily make your Mac any less secure it does put the onus on you to verify the download sources are free from malware and are not accessing parts of the Mac system that contain sensitive data. Xcode is a big application ~17Gb, over a typical fibre 38 Mb/s broadband internet connection it takes around forty minutes to download, you should temporarily disable sleep and screensaver in Mac settings if you want the download to complete uninterrupted otherwise it can take several hours and require you to continually wake the Mac from sleep. Xcode is free from Apples App Store, you should install this before trying to install Homebrew. Homebrew requires the use of Apples Xcode command line tool and for recent Apple OS’s Xcode is not installed by default.

You will find Terminal via the desktop header menu: Go > Applications > Utilities > Terminal, alternatively, from the Launchpad icon on the bookshelf.

Merge pages on pdf preview mac os x el capitan 10.11.6