Exploring Essential Linux Commands with Fruits and Colors! 🍏📂🌈
Welcome to Day 3 of our 90 Days of DevOps journey! Today, we'll dive into the world of Linux commands and explore some fundamental operations that every DevOps engineer should be familiar with. But wait, we won't be limited to boring examples! We'll use fruits and colors to make it more engaging. Let's get started!
1. Viewing the Contents of a File 📄
To check what's written inside a file, we can use the cat command. For instance, to view the contents of a file named "fruits.txt," you can run the following command:
cat fruits.txt
2. Changing Access Permissions of Files 🔐
In Linux, we can modify the access permissions of files using the chmod command. This command allows us to control who can read, write, or execute a file. To change the access permissions of a file named "file.txt" to read and write for the owner, and only read for others, you can use the following command:
chmod 644 file.txt
3. Checking Command History ⏲️
To see the list of commands you've executed so far, you can make use of the history command. It displays a numbered list of recently executed commands. To view your command history, simply type:
history
4. Removing a Directory/Folder 🗑️ To delete a directory (folder) and its contents in Linux, we can employ the rm command with the -r option. This command recursively removes all files and subdirectories within the specified directory. For instance, to remove a directory named "myfolder," you can use the following command:
rm -r myfolder
5. Creating and Viewing the Content of a File 📝 To create a new file named "fruits.txt" and view its content, we can use the touch and cat commands together. First, create the file using:
touch fruits.txt
Next, open the file and add some content to it using a text editor of your choice. Finally, to view the content of "fruits.txt," run:
cat fruits.txt
6. Adding Content to devops.txt 📝 To add content to a file named "devops.txt," where each item is on a separate line, we can use a text editor or the echo command. For example, to add fruits in separate lines, run the following commands one by one:
echo "Apple" >> devops.txt
echo "Mango" >> devops.txt
echo "Banana" >> devops.txt
echo "Cherry" >> devops.txt
echo "Kiwi" >> devops.txt
echo "Orange" >> devops.txt
echo "Guava" >> devops.txt
7. Showing Only the Top Three Fruits from the File 👆 To display only the top three fruits from the "devops.txt" file, we can use the head command. The -n option specifies the number of lines to show. In this case, we want to show the top three fruits, so the command would be:
head -n 3 devops.txt
8. Showing Only the Bottom Three Fruits from the File 👇 To exhibit only the bottom three fruits from the "devops.txt" file, we can utilize the tail command. Similar to head, the -n option is used to specify the number of lines to display. For instance, to show the bottom three fruits, execute:
tail -n 3 devops.txt
9. Creating Another File named Colors.txt and Viewing its Content 🎨 To create a new file named "Colors.txt" and view its content, follow these commands:
touch Colors.txt
Next, open the file and add some content, such as colors, using your preferred text editor. To view the content of the "Colors.txt" file, use the cat command:
cat Colors.txt
10. Finding the Difference Between fruits.txt and Colors.txt Files 🍎🎨 To find the difference between the "fruits.txt" and "Colors.txt" files, we can use the diff command. This command compares the contents of two files and highlights the dissimilarities. For instance, to compare the two files, run:
diff fruits.txt Colors.txt
That's it for today! We hope you enjoyed exploring these essential Linux commands while playing with fruits and colors. Stay tuned for more exciting DevOps topics in our 90 Days of DevOps journey! 🚀🌐