DEV Community: Jagannath Ghantenavar

Controlling File and Directory Permissions in Linux | Day 3

Jagannath Ghantenavar — Wed, 07 Aug 2024 15:13:27 +0000

Linux permissions are categorized into three types:
read (r),
write (w),
execute (x).

Each file or directory has three levels of permissions: user, group, and everyone, which define who can do what with the file. ( -rw-rw-r-- this indicates -user-group-everyone-- what access dose the particular level has for that file or Dir.

To modify these permissions, the chmod command is used. For example, to grant execute permissions to a file or directory, the command chmod +x filename is used.
Similarly, to remove permissions, the chmod command can be used with a - sign. For instance, chmod -w filename would remove write permissions from a file, preventing it from being altered.

A Quick Dive into the Basics | Linix | DAY 2

Jagannath Ghantenavar — Mon, 05 Aug 2024 06:19:53 +0000

This weekend, I decided to spend some time sharpening my Linux command-line skills. There's something satisfying about getting comfortable with the basics, and it helps build a strong foundation for more advanced tasks. Here’s a quick recap of what I practiced:

Displaying the Date and Time
The first command I explored was the date command. It’s straightforward but essential for checking the current date and time.

To simply display the current date and time:
$ date
If you need the time in GMT/UTC:
$ date -u

This command is particularly handy when working with servers across different time zones.

Echoing Text with Quotes
Next up was the echo command, which is used to print text to the terminal. It’s often used in scripts to display messages or output variables.

Using double quotes to print a simple message:
$ echo "Hello World"

It’s a simple command, but understanding how to use quotes can be important, especially when working with strings that contain spaces or special characters.

Listing Directory Contents with ls
The ls command is one of the most frequently used in Linux. It lists the contents of a directory and comes with several useful options.

To list files and directories in the current directory:
$ ls
For a more detailed list, showing file permissions, ownership, and size:
$ ls -l
To list files with sizes in a human-readable format (like KB, MB):
$ ls -lh

Practicing these commands reinforced my understanding of basic file and system management in Linux. It was a productive weekend, and these small exercises reminded me of the power and simplicity of the command line. I’m looking forward to diving deeper into more complex commands and scripting in the coming weeks!

To Reverse a string with out using for loop in python. | DAY 1

Jagannath Ghantenavar — Tue, 30 Jul 2024 17:38:14 +0000

a = 'Dev.to'
a[::-1]

Explanation :

[start index : end index : step parameter ]

The first colon : indicates the start index (default is the beginning of the sequence).
The second colon : indicates the end index (default is the end of the sequence).
The third colon : indicates the step parameter, which means the sequence should be traversed in steps of -1 (i.e., in reverse)..