Linux Shell Scripting Cookbook, Second Edition - Second Edition

Generating blank files in bulk

Sometimes we may need to generate test cases to test programs that operate on thousands of files. Let's discuss how to generate such files in this recipe.

Getting ready

touch is a command that can create blank files or modify the timestamp of files if they already exist. Let's take a look at how to use them.

How to do it...

1. A blank file with the name filename will be created using the following command:

   $ touch filename
   

2. Generate bulk files with a different name pattern as follows:

   for name in {1..100}.txt
   do
     touch $name
   done

   In the preceding code {1..100} will be expanded as a string "1, 2, 3, 4, 5, 6, 7...100". Instead of {1..100}.txt, we can use various shorthand patterns such as test{1..200}.c, test{a..z}.txt, and so ...