Learn Linux Shell Scripting - Fundamentals of Bash 4.4

Globbing and the for loop

Now, let's look at a few more practical examples. Most things you will do on Linux will deal with files (remember why?). Imagine that you have a bunch of log files sitting on the server and you'd like to perform some actions on them. If it is just a single action with a single command, you can most probably use a globbing pattern with that command (such as with grep -i 'error' *.log). However, imagine a situation where you want to collect log files that contain a certain phrase, or perhaps only the lines from those files. In this case, using a globbing pattern in combination with a for loop will allow us to perform many commands on many files, which we can find dynamically! Let's give it a go. Because this script ...