--- title: "Erkan Güzeler (@coderkan) | Hashnode" description: "Software Developer. Read the latest articles by Erkan Güzeler on Hashnode." url: "https://hashnode.com/@coderkan" --- @coderkan # Erkan Güzeler @coderkan · Turkey, Kocaeli · Joined January 2021 Software Developer [Website](https://erkanguzeler.com/) ### [Changing More Than One File’s name in Linux](https://erkanguzeler.com/changing-more-than-one-files-name-in-linux?utm_source=hashnode&utm_medium=feed) Hi everyone, Changing the name of the file is a normal situation in your daily life. It is easy, just right click then choose the rename then change it or you can use the command mv old-file-name new-file-name in the Linux environment. What if I n... 2 min read · [erkanguzeler.com](https://erkanguzeler.com/changing-more-than-one-files-name-in-linux?utm_source=hashnode&utm_medium=feed) [Mar 21, 2023](https://hashnode.com/posts/changing-more-than-one-files-name-in-linux/64199d55f277980a5a07f0ea) ### [Adding Text to First and Last Line of File in Linux](https://erkanguzeler.com/adding-text-to-first-and-last-line-of-file-in-linux?utm_source=hashnode&utm_medium=feed) Hi everyone, Let’s assume that you have many files to that you wanted to add some text to the first line or end line. If you are a Linux user, this is easy to do. I am using sed and tee commands to add something to the file. Firstly, I would like to... 2 min read · [erkanguzeler.com](https://erkanguzeler.com/adding-text-to-first-and-last-line-of-file-in-linux?utm_source=hashnode&utm_medium=feed) [Jan 11, 2023](https://hashnode.com/posts/adding-text-to-first-and-last-line-of-file-in-linux/63becefe6588b999a44128c2) ### [Port XXXX already in use: How to solve it?](https://erkanguzeler.com/port-xxxx-already-in-use-how-to-solve-it?utm_source=hashnode&utm_medium=feed) Hi everyone, While developing the application, you come across the problem with Port XXXX already in use. Your system has already run the application that uses your port in the background. And If you rerun your application, you get an error like Por... 4 min read · [erkanguzeler.com](https://erkanguzeler.com/port-xxxx-already-in-use-how-to-solve-it?utm_source=hashnode&utm_medium=feed) [Jun 12, 2022](https://hashnode.com/posts/port-xxxx-already-in-use-how-to-solve-it/62a5aa4f4754a2eb1e0a554b) ### [Spring Boot: Usage of Liquibase](https://erkanguzeler.com/spring-boot-usage-of-liquibase?utm_source=hashnode&utm_medium=feed) Hi everyone, We work with databases as software developers. They are a big part of the development life cycle. At the beginning of the project, you easily handle database changes, but you will get into trouble later. There are many changes to the dat... 5 min read · [erkanguzeler.com](https://erkanguzeler.com/spring-boot-usage-of-liquibase?utm_source=hashnode&utm_medium=feed) [May 28, 2022](https://hashnode.com/posts/spring-boot-usage-of-liquibase/6291f29f0989e6b52feaf045) ### [Usage of Axios.all() - Concurrent Http Request](https://erkanguzeler.com/usage-of-axiosall-concurrent-http-request?utm_source=hashnode&utm_medium=feed) Hi everyone, I am here again, but this article will be different than others. I have had a chance to develop a React.js project for one of our client. I have usually been involved in Angular based projects. The client also wanted us to develop a Re... 2 min read · [erkanguzeler.com](https://erkanguzeler.com/usage-of-axiosall-concurrent-http-request?utm_source=hashnode&utm_medium=feed) [Oct 31, 2021](https://hashnode.com/posts/usage-of-axiosall-concurrent-http-request/617eee7ad55bde5cb6682f05)