Shell Scripting Tutorial for Beginners I am sharing few beginner shell scripting reference that we need in day-to-day tasks. Local Variable in Shell Script We can create local variables in shell script by using the keyword local. #!/bin/bash HELLO=Hello function helloWorld { local HELLO=World echo $HELLO } echo $HELLO helloWorld echo $HELLO Conditional Statement 1)…
IPv4 forwarding is disabled WARNING I was facing this issue while creating a Docker image in Centos 7. Error: —> [Warning] IPv4 forwarding is disabled. Networking will not work. Solution: Add net.ipv4.ip_forward=1 in /etc/sysctl.conf Restart network service $ systemctl restart network.
Helm Charts — And Why Raw YAML Gets Painful Fast Start With the Problem Imagine you’re deploying a simple web app to Kubernetes. You write a deployment.yaml, a service.yaml, maybe an ingress.yaml and a configmap.yaml. That’s already 4 files just for one app. Now imagine doing that for 10 microservices, across 3 environments (dev, staging,…
Changes in PHP ternary operator since PHP 5.3 Till PHP 5.2 $varName = ($cond) ? $cond : ‘false’; From PHP 5.3 $varName = ($cond) ? : ‘false’; No need to write condition for true. It will automatically taken $cond in true. Reference URL :- http://www.php.net/manual/en/language.operators.comparison.php#language.operators.comparison.ternary
Here is the simple step by step guideline to cut and paste in Vim editor. Press esc if vim editor in insert mode Position the cursor where you want to start cutting. Press v to select the characters and move the cursor at end of character you want to cut. …
Terraform Workspaces vs Separate Directories: Which is Better for Dev/Prod? Managing multiple environments like Dev, Staging, and Production is one of the most common Terraform challenges. You have two main approaches: Workspaces and Separate Directories. Here is how they differ and when to use each. Terraform Workspaces Workspaces allow multiple state files within the same…
Find the Factorial of a Number in Python The factorial of a number n (written as n!) is the product of all positive integers up to n. For example, 5! = 5 × 4 × 3 × 2 × 1 = 120. Using Recursion def factorial_recursive(n): if n == 0 or n == 1: return…
Remove Duplicates from a List in Python Cleaning a list of duplicate values is a frequent data processing task. Python offers several clean approaches depending on whether order matters. Fastest Method: Convert to Set (Order Not Preserved) my_list = [1, 2, 2, 3, 4, 4, 5] unique_list = list(set(my_list)) print(unique_list) # Output: [1, 2, 3,…
Check for Anagrams in Python Two strings are anagrams if they contain the same characters in the same frequency, just in a different order. For example, “listen” and “silent” are anagrams. Solution 1: Sort and Compare def is_anagram(s1, s2): return sorted(s1.lower()) == sorted(s2.lower()) print(is_anagram(“listen”, “silent”)) # True print(is_anagram(“hello”, “world”)) # False Solution 2: Using Counter…
How to validate date format in shell script There are multiple ways you can validate date format in shell script. You can compare date format with regular expression or you can use inbuilt date command to check given date format is valid or not. I am sharing a simple date command to validate the date…
