Basic Linux Commands and Their Usage

cat To view what's written in a file

chmod File permissions consist of three types: read, write, and execute, each represented by the letters r, w, and x, respectively. The chmod command allows you to set or change these permissions for a file or directory

history Display a list of previously executed commands in the current shell session

rm -r Used to recursively remove directories and their contents. It is a powerful command that can delete a directory and all its subdirectories and files contained within them.

cat > fruits.txt & cat fruit.txt To create a fruits.txt file and view content inside it. By cat, it allows you to add content in fruits.text and by Ctrl + D you can exit from fruits.text

vim devops.txt Add content in devops.txt. To insert something press i then add your content. To save and quit the file, press esc and then type :qw or :x to save the changes and exit the editor

head -3 Display the first three lines of a file. The -3 option in head -3 specifies the number of lines to display. You can adjust the number as needed to show a different number of lines

tail -3 Display only bottom three lines from the file

ls Used to list files and directories in a directory. It provides information about the files and directories present, such as their names, permissions, sizes, and timestamps

sudo Allows authorized users to execute commands with administrative or superuser privileges. It stands for "Superuser Do"