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Sometimes you need to use the ls command on your Linux or Unix machine and match the pattern, interpreting upper- and lowercase letters as the same. In other words, I tell ls to find and list files regardless of their case insensitive. For instance, I am going to tell ls command command to ignore the case so that it can match files such as: ``` ls *service*.pdf ``` SERVICE.pdf DELL-Service-M6700.pdf hp-printer-Service-Manual.pdf In this quick tip, I explain how to match case insensitive patterns with the ls command on your Linux, macOS, *BSD and Unix-like system.