Can you use the tac command in Terminal?

I'm trying to search a large file in reverse ord开发者_Go百科er from the command line (using terminal). I found the tac command: http://clifgriffin.com/2008/11/25/tac-and-reverse-grep/

tac is the inverse of cat. However, when I try to use the tac command in terminal, it says that command doesn't exist. Is there a way I'd be able to use tac in terminal? What are some other fast ways to search a file from the end via the command line?

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The MacOs version of tail support the -r ("reverse") option, and defaults to displaying the entire file from the end. So tail -r filename should be exactly equivalent to tac filename.

Or, you could try building tac yourself from the source code. It's part of the GNU coreutils package.

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It's easy using OSX Homebrew:

brew install coreutils

Then it's available as gtac (as in GNU tac), for example:

# Find and parallel copy all files in reverse order
find . -print | gtac | parallel copy "{}" destination/