Learn to Code. Shape Your Future
The chmod command modifies the permissions of a file or directory on a Linux system. The three numbers after the chmod command represent the permissions assigned to user owner, group owner and others. The numbers 755 assign read-write-execute permissions to the user ower and read-execute permissions to group owner and others. In this article I … Read more
In this article you will learn how to create a while loop in Bash. While loops are used in Bash scripting and in many other programming languages… Let’s create a loop that goes through N numbers and prints only the odd ones. You will see how our script looks like if we hardcode the value … Read more
Do you want to download files via the command line on a Linux system? With cURL you can do that. I will show you how to download files with curl, but let’s start from the basics first. More generally, you can use curl to transfer data from or to a server. It supports a long … Read more
Copying files between Linux systems is very common. In this article you will learn how to copy files in a secure way using the SCP command on Linux (and Unix-like systems). What is the SCP Linux command? The protocol used for copying files between computers is SCP (Secure Copy Protocol) that is based on the … Read more
In Bash scripts is very common to check if a file or a directory exist. How do you check if a file or a directory exists using Bash? In Linux everything is a file. You can use the test command followed by the operator -f to test if a file exists and if it’s a … Read more
Have you ever heard about the concept of symbolic link in Linux? You might have heard the word symlink instead…they are the same thing. What is a symbolic link? A symbolic link in Linux (or Unix-like operating systems) is a shortcut to a file or directory. You can use it to simplify the way you … Read more
Using the cURL command in a Bash script can be useful, but why? We live in the era of APIs… …you ask for data and you get it back… But how can you know if your API request is successful? HTTP response codes are able to tell you that, for example, a successful request is … Read more
Have you ever tried to get the directory of your Bash script programmatically? It’s a common thing people ask and it can be done in different ways. The first thing to look at to solve this problem is the $0 variable, used in Bash to store the first element of the command executed. Create a … Read more
Why would you exit from a Bash script? Let’s say you are writing a script…there’s one thing that is almost certain… At some point, your script is likely to break because of unexpected conditions you might have not considered. So, what can you do about it? How can you exit a Bash script in case … Read more
Knowing how to count the lines of a file or from the output of a command is a must in Linux. How to count the lines in a file with Linux? Linux provides the wc command that allows to count lines, words and bytes in a file or from the standard input. It can be … Read more
