grep: Counting Results

Grep is one of the key Unix/Linux utilities for any user, whether you are a systems administrator, developer or general desktop user using grep can save you a ton of time. Below is an example of counting the number of lines that match the search string. This can be extremely useful if you are looking through large log files or sometimes even the passwd file.


[[email protected] ~]$ grep -c root /etc/passwd  

In the above example you can see there are 2 lines with the word root. The next example will show you the number of lines that do not have the search string of root in them.

[[email protected] ~]$ grep -vc root /etc/passwd  
Benjamin Cane
Principal Engineer, Vice President

Benjamin Cane is Principal Engineer at American Express. He has more than 16 years of experience with roles in both systems and software engineering. He leverages both his systems and software skills to build end-to-end platforms. Platforms, purpose built for performance and resiliency. Benjamin is also the author of Red Hat Enterprise Linux - Troubleshooting Guide (2015, Packt Publishing), and he has published many popular articles on topics such as Linux, Docker, Python, Go and Performance Tuning. Thoughts and Opinions expressed in my articles are my own.