Featured Post

15 Python Tips : How to Write Code Effectively

-
Image
 Here are some Python tips to keep in mind that will help you write clean, efficient, and bug-free code.     Python Tips for Effective Coding 1. Code Readability and PEP 8  Always aim for clean and readable code by following PEP 8 guidelines.  Use meaningful variable names, avoid excessively long lines (stick to 79 characters), and organize imports properly. 2. Use List Comprehensions List comprehensions are concise and often faster than regular for-loops. Example: squares = [x**2 for x in range(10)] instead of creating an empty list and appending each square value. 3. Take Advantage of Python’s Built-in Libraries  Libraries like itertools, collections, math, and datetime provide powerful functions and data structures that can simplify your code.   For example, collections.Counter can quickly count elements in a list, and itertools.chain can flatten nested lists. 4. Use enumerate Instead of Range     When you need both the index ...
Post a Comment

How to Understand the 'ps' Command output in Linux

-
You can get process details by using the ps command. Those are number of processes running in a current Session, and other parameters about the process.  

Here is all about how to use ps command in Linux.


The ps command


How to use ps command



Here's an example that is how it appears when you issue the 'ps' command.

  • PID (Process Id) - It is the process identification number.
  • TTY(Terminal name) - associated with this process
  • TIME(Time) - the format is hh: mm: ss (Hours, Minutes, and Seconds). Cumulated time of that particular process.
  • CMD (Executable Command name). You May Also Like: PS Command Options in Linux

How to understand slave/master terminal

Here is all about Slave and Master terminal.
  • The pts/0 is the slave terminal. The pts means pseudo terminal slave. Raise your knowledge by bringing in these quick definitions. LINUX - DIFFERENCE BETWEEN TTY AND PTS.
  • In reality, the terminals are two types. One is ptmx (Master) and pts (Slave).
  • The master terminal holds the details of slaves. Those are pts/0, pts/1, and so on.
  • The slave numbers start from 0, 1, 2, 3...
  • The Psuedo terminals ( Master and Slave) are present in the/dev directory.

How to Locate Master/Slave Terminals




On top of that, pseudo terminals are two types. BSD style and UNIX98 style. The UNIX98 is the newest style. BSD-style pseudoterminals vs. UNIX 98 pseudoterminals.

How to use ps -eF command




The Output of ps -eF

  • UID (user id)-it is a root user
  • PID (Process Id)
  • PID (Parent process id)
  • C (Processer utilization). Currently, it is '0'.
  • SZ (size)
  • RSS (Resident set size). Non-swapped physical memory.
  • PSR (Processor number to which this process is assigned)
  • STIME (Start Time)
  • TTY (see the above)
  • TIME (Cumulative CPU time)
  • CMD (The executable command details). Here, I have issued ps -eF. You can see this command in the above picture.


How to get count of processes

Here's the command to use quickly.

$ ps | wc -l
4


References

Comments

Post a Comment

Thanks for your message. We will get back you.

Popular posts from this blog

How to Fix datetime Import Error in Python Quickly

-
Image
Here's a quick resolution for import datetime Python error . The reason is your .py python script name and datetime  are the same. I'll show you how this error happens and its resolution.   Here's the Resolution for ImportError I've created a script called 'datetime.py.' to check whether the minute value is 'odd' or not. During the import of my python script, I got the import error cannot import name datetime. My Script: datetime.py My script's intention is to find whether the minute value is odd or not. Python Logic from datetime import datetime odds = [ 1 , 3 , 5 , 7 , 9 , 11 , 13 , 15 , 17 , 19 , 21 , 23 , 25 , 27 , 29 , 31 , 33 , 35 , 37 , 39 , 41 , 43 , 45 , 47 , 49 , 51 , 53 , 55 , 57 , 59 ] right_this_minute = datetime.today().minute if right_this_minute in odds: print ( "This minute seems a little odd." ) else : print ( "Not an odd minute." ) ImportError I have imported my datetime.py from Linux. It gives an error ...
Read more

SQL Query: 3 Methods for Calculating Cumulative SUM

-
Image
SQL provides various constructs for calculating cumulative sums, offering flexibility and efficiency in data analysis. In this article, we explore three distinct SQL queries that facilitate the computation of cumulative sums. Each query leverages different SQL constructs to achieve the desired outcome, catering to diverse analytical needs and preferences. Using Window Functions (e.g., PostgreSQL, SQL Server, Oracle) SELECT id, value, SUM(value) OVER (ORDER BY id) AS cumulative_sum  FROM your_table; This query uses the SUM() window function with the OVER clause to calculate the cumulative sum of the value column ordered by the id column. Using Subqueries (e.g., MySQL, SQLite): SELECT t1.id, t1.value, SUM(t2.value) AS cumulative_sum FROM your_table t1 JOIN your_table t2 ON t1.id >= t2.id GROUP BY t1.id, t1.value ORDER BY t1.id; This query uses a self-join to calculate the cumulative sum. It joins the table with itself, matching rows where the id in the first table is greater than...
Read more

Big Data: Top Cloud Computing Interview Questions (1 of 4)

-
Image
The below are frequently asked interview questions on Cloud computing: 1) What is the difference between Cloud and Grid? Grid: -Information service -Security Service -Data management -Execution Manageement Cloud: - Maintains up-to-date information of resources -Create VMs according to user requirement -Application deploment -User management 2) What are the different cloud standards? -Interoperability standards -Security standards -Portability Standards -Governance and Risk standards 3) What are the two different sub-systems in Cloud computing ? -Management sub system -Resource sub system 4)What is Cloud compouting? The promise of cloud computing is ubiquitous access to a broad set of applications and services, which are delivered over the network to multiple customer. 5) Why we need specialized network for Cloud services? The public Internet is the simplest choice for delivering cloud-based services. In this model, the cloud provider simply purchases Inter...
Read more