bash

I recently needed to issue several dozen HTTP DELETE REST API calls of the form http://www.example.com/blah/n where n was a sequential version number. In this post I’ll show how to do this easily from the command line.

Let’s say you have two text files, FileA and FileB.  You want a file that has all the lines of FileA that are_ not_ in FileB.  How do you do that?

The simple answer is grep. The -v option inverts the search, and only prints lines that do not match.  The -f option is used to specify a file that contains a list of all the patterns for which to look - one pattern per line.

When you’re working in Unix or Linux or even Mac OS X, there are often times when you need to apply the same command to a list of files.  In this post I’ll show you a couple of quick ways to do this using the bash shell.