Bash Script Generate Random Key
Terraform allows you to define and create complete infrastructure deployments in Azure. You build Terraform templates in a human-readable format that create and configure Azure resources in a consistent, reproducible manner. This article shows you how to create a complete Linux environment and supporting resources with Terraform. Random String Generator. This form allows you to generate random text strings. The randomness comes from atmospheric noise, which for many purposes is better than the pseudo-random number algorithms typically used in computer programs. Generate random strings (maximum 10,000). Each string should be characters long (maximum 20). Nov 15, 2013 HowTo: Linux Random Password Generator Command last updated November 15, 2013 in Categories BASH Shell, Commands, Linux H ow do I generate random passwords on the Linux command line using the bash shell? Bash also provides a shell variable named RANDOM for the express purpose of generating a random integer. Each time this parameter is referenced, a random integer between 0 and 32767 is generated. Assigning a value to this variable seeds the random number generator. Command line password generator. This page contains scripts that may be used to create 20 digit passwords on the command line. These are compatible with the online SS64 password generator and will produce the same passwords.
An array is a data structure consist multiple elements based on key pair basis. Each array element is accessible via a key index number.
This tutorial will help you to create an Array in bash script. Also, initialize an array, add an element, update element and delete an element in the bash script.
Define An Array in Bash
You have two ways to create a new array in bash script. The first one is to use declare command to define an Array. This command will define an associative array named test_array.
In another way, you can simply create Array by assigning elements.
Access Array Elements
Similar to other programming languages, Bash array elements can be accessed using index number starts from 0 then 1,2,3…n. This will work with the associative array which index numbers are numeric.
To print all elements of an Array using @ or * instead of the specific index number.
Loop through an Array
You can also access the Array elements using the loop in the bash script. A loop is useful for traversing to all array elements one by one and perform some operations on it.
2 4 | do done |
Adding New Elements to Array
Create Bash Script
You can add any number of more elements to existing array using (+=) operating. You just need to add new elements like:
View the array elements after adding new:
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Generate Random Number Bash
Update Array Elements
To update the array element, simply assign any new value to the existing array by the index. Let’s change the current array element at index 2 with grapes.
View the array elements after adding new:
Delete An Array Element
You can simply remove any array elements by using the index number. To remove an element at index 2 from an array in bash script.
View the array elements after adding new:
| #! /usr/bin/env bash |
| # Create the CA Key and Certificate for signing Client Certs |
| openssl genrsa -des3 -out ca.key 4096 |
| openssl req -new -x509 -days 365 -key ca.key -out ca.crt |
| # Create the Server Key, CSR, and Certificate |
| openssl genrsa -des3 -out server.key 1024 |
| openssl req -new -key server.key -out server.csr |
| # We're self signing our own server cert here. This is a no-no in production. |
| openssl x509 -req -days 365 -in server.csr -CA ca.crt -CAkey ca.key -set_serial 01 -out server.crt |
| # Create the Client Key and CSR |
| openssl genrsa -des3 -out client.key 1024 |
| openssl req -new -key client.key -out client.csr |
| # Sign the client certificate with our CA cert. Unlike signing our own server cert, this is what we want to do. |
| # Serial should be different from the server one, otherwise curl will return NSS error -8054 |
| openssl x509 -req -days 365 -in client.csr -CA ca.crt -CAkey ca.key -set_serial 02 -out client.crt |
| # Verify Server Certificate |
| openssl verify -purpose sslserver -CAfile ca.crt server.crt |
| # Verify Client Certificate |
| openssl verify -purpose sslclient -CAfile ca.crt client.crt |
| #all this is taken from https://github.com/nategood/sleep-tight/blob/master/scripts/create-certs.sh |
| #also see: https://gist.github.com/komuW/5b37ad11a320202c3408 |