What I learned new this week (week 1)

Before beginning with it I should clearify first why am I writing this. Every day we learn something, specially me because I recently started using Linux for fulltime. So I am learning something every day about it. But I find out that I forget most of it because I do not write it down. So I start writing it down. Also I thought that I should share this with everyone. There might be some information which is new to you. So let’s get started.

Small Disclaimer:- it is not a typical blog post where we deeply discuss about something. Here I will provide only a small brief about lots of thing.

  1. In Python: To convert a string of date e.g., ‘2024-07-06’ into its corresponding timestamp in milisecond we can use python’s built-in dateutil modules parser.

from dateutil import parser

datetime_obj = parser.parse('2024-07-06')

print(datetime_obj.timestamp())

  1. In Linux: The PATH enviroment variable contains all the path of different directories where our system will look of executables. For Example- when we use gcc command to compile C Code our system goes through each of the paths to find gcc. When it finds the binary for gcc it execute our command to compile the C Code else we get the error saying gcc is not installed.

  2. PATH Variable: To add new path to a directory binary and executables in the PATH enviroment variable we can use 2 different ways. First one is temporary and second one is permanent.

  • To add new path in the PATH Variable temporarily just enter the following command in the terminal.

export PATH=$PATH:/path/to/directory

  • To add new path in the PATH Variable permanently we have to follow few steps.

i. Open ~/.bashrc file using vim. -> vim ~/.bashrc. ZSH users will open .zshrc.

ii. And wite the same commands of temporary addition there. Then Save it.

export PATH=$PATH:/path/to/directory

iii. Reload the shell.

  1. In Linux: We can use echo $0 to print which shell are we using. For shell scripting we can just use $0.

  2. In Linux: we can use lspci command to get information about pc hardward. Like- name of Audio Device, name of USB Controller.

  3. In Linux: lsb_release -a command will show you a brief info about your os. Like distributor name, release version.

  4. In Linux: hostnamectl chassis will output which type of device you have. Laptop or PC.

That’s it for this week because I still forgot to notedown few things. Meeting you next week.