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1. Top results related to what should i know before writing a shell script to start a file

   • I am trying to write a shell script to read username from a file, but it is not working. I am posting script I am writing and output

     Top Answer

     Answered Jan 30, 2020 · 0 votes

     You just have to get the input for the do loop right:

     #!/bin/bashif [ -f "$1" ]then for user in $(cat "$1") do useradd "$user" doneelse echo "input is not a file"fi

     Remarks: this works for reading out a file word-by-word and I tried to keep your structure.

     For reading out files line by line this is an elegant way: https://stackoverflow.com/a/4642213/2819581

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     1/5

   • Shell Script writing output to a file

     Top Answer

     Answered Nov 13, 2017 · 3 votes

     Your redirection to log file isn't right because it's inside the while loop. Use the redirection at the end of the while loop:

     while read -r LINE; do...done < "$input_file" > "log.txt"-

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     2/5

   • What should I know about C# before walking into an interview for a .NET job?

     Top Answer

     Answered Mar 02, 2009 · 7 votes

     They are likely going to ask you questions that are based more on Object Oriented Design and Programming more than questions that are explicitly geared towards C#. So if you can explain abstraction, polymorphism, interfaces, etc. You should be good to go.

     Other Answers

     Answered Mar 02, 2009 · 7 votes

     Reference vs value types.

     Other Answers

     Answered Mar 02, 2009 · 5 votes

     Know your delegates. Every .Net interview I've been on has asked me about delegates. Know why they exist, know how to declare them, and how to consume them, understand what multicast delegate is. Understand how to use a multicast delegate when one of the handlers throws an exception. Know what the compiler does with a delegate. Understand how delegates can give you "automatic" asynchronous APIs. Get familiar with the newer more convenient generic delegates - Action and Func.

     Bonus: delegates vs events. What are the differences? When would you use one over the other?

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     3/5

   • Writing a shell script to loop and print out numbers 0-100 and if they are even or odd

     Top Answer

     Answered Mar 31, 2020 · 0 votes

     You are missing a then after if. Also your test expression in if is incorrect

     for i in {0..100}doif [ $(($i % 2)) -eq 0 ]then echo "Number: $i and is even."else echo "Number: $i and is odd."fidone

     $(($i % 2)) is for Arithmetic-Expansion

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     4/5

   • I am writing a C# code and I want a link from the WhatsApp API to run at the code to send message automatically and I cant find it what should I do?

     Top Answer

     Answered Sep 12, 2022 · 1 votes

     Here is a quick example of how to use an HttpClient to send the data you need to send to the WhatsApp On-Premises Business API. This example is not complete and cannot be directly implemented into production but does show you how to form the post to the WhatsApp API. Do bear in mind you may need to add auth headers and other parts to the request and this is a minimum example that only shows how to form the request itself.

     The URI for the API will be different so this example will always return an error message from Facebook.

     using System;using System.Collections.Generic;using System.Net.Http;using System.Threading.Tasks;namespace testingapp{ class Program { static readonly HttpClient client = new HttpClient(); static async Task Main(string[] args) { //var x will either contain the message ID if needed for //future use or it will contain the error message from the server. var x = await Task.Run(() => sendMessage()); } static async Task<string> sendMessage() { try { var textMessage = "Test message"; var message = new Dictionary<string, string> { {"preview_url", "false" }, { "recipient_type", "individual"}, { "to", "whatsapp-id" }, { "type", "text"}, { "body", textMessage} }; var content = new FormUrlEncodedContent(message); HttpResponseMessage response = await client .PostAsync("https://example.facebook.com/whatsapp/api/messages/text" , content); string responseBody = await response.Content.ReadAsStringAsync(); return responseBody; } catch (HttpRequestException e) { return e.Message.ToString(); } } }}

     If you want to respond to a message you will need to implement a similar solution using WhatsApps API to respond to a specific message. Definitely refer to their documentation for the proper structure of a message to them.

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     5/5

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2. www.howtogeek.com · 67469 · the-beginners-guide-toThe Beginner's Guide to Shell Scripting: The Basics - How-To Geek

   www.howtogeek.com · 67469 · the-beginners-guide-to

   

   Sep 29, 2015 · Shell scripts allow us to program commands in chains and have the system execute them as a scripted event, just like batch files. They also allow for far more useful functions, such as command substitution. You can invoke a command, like date, and use it's output as part of a file-naming scheme.

3. People also ask

   What is a shell script?

   • Shell scripts allow us to program commands in chains and have the system execute them as a scripted event, just like batch files. They also allow for far more useful functions, such as command substitution. You can invoke a command, like date, and use it's output as part of a file-naming scheme.

   The Beginner's Guide to Shell Scripting: The Basics - How-To Geek

   www.howtogeek.com/67469/the-beginners-guide-to-shell-scripting-the-basics/

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   What's a good introduction to shell scripting?

   • Modified by Jason Baker. CC BY-SA 2.0. The world's best conceptual introduction to shell scripting comes from an old AT&T training video.

   Getting started with shell scripting - Opensource.com

   opensource.com/article/17/1/getting-started-shell-scripting

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   Why is shell scripting important in Linux?

   • Shell scripting is an important part of process automation in Linux. Scripting helps you write a sequence of commands in a file and then execute them. This saves you time because you don't have to write certain commands again and again. You can perf...

   Shell Scripting for Beginners – How to Write Bash Scripts in Linux

   www.freecodecamp.org/news/shell-scripting-crash-course-how-to-write-bash-scripts-in-linux/

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   What is the difference between a shell and a bash script?

   • A shell is a command line interpreter that accepts and runs commands. Bash is often the default shell in most Linux distributions. This is why bash is synonymous to shell. The shell scripts often have almost the same syntaxes, but they also differ sometimes. For example, array index starts at 1 in Zsh instead of 0 in bash.

   linux - Why do you need to put #!/bin/bash at the beginning of a script

   stackoverflow.com/questions/8967902/why-do-you-need-to-put-bin-bash-at-the-beginning-of-a-script-file

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4. stackoverflow.com · questions · 8967902Why do you need to put #!/bin/bash at the beginning of a ...

   stackoverflow.com · questions · 8967902

   

   Jan 23, 2012 · Adding #!/bin/bash as the first line of your script, tells the OS to invoke the specified shell to execute the commands that follow in the script. #! is often referred to as a "hash-bang", "she-bang" or "sha-bang".

5. Videos

   • 

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     Shell Scripting Crash Course - Beginner Level

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     6:33

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     Introduction to Shell Scripting | Shell Scripting Tutorial for Beginners

     Nov 27, 2022

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     Shell Scripting Tutorial for Beginners 1 - Introduction

     Feb 18, 2017

     1.5M Views

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6. www.freecodecamp.org · news · shell-scripting-crashShell Scripting for Beginners – How to Write Bash Scripts in ...

   www.freecodecamp.org · news · shell-scripting-crash

   

   Mar 31, 2022 · When you first launch the shell, it uses a startup script located in the .bashrc or .bash_profile file which allows you to customize the behavior of the shell. When a shell is used interactively, it displays a $ when it is waiting for a command from the user. This is called the shell prompt.

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8. medium.com · @jesse · better-shell-scriptsWriting my first shell script | Linux Fundamentals | by Jesse ...

   medium.com · @jesse · better-shell-scripts

   

   The best beginner guide when you decide to write your first shell script. Make the shell script executable with a shebang and file permissions.

9. www.gauchocode.com · mastering-bash-i-our-first-scriptWriting your first Bash script: Best practices and examples

   www.gauchocode.com · mastering-bash-i-our-first-script

   

   Apr 20, 2023 · Step 1: Create our first Script. There is no better way to learn than by practicing, so the first step will be to create the foundation of our Bash script and then gradually test and execute code on it as needed. Open your text editor and create a new file. We’ll call this file “ myscript.sh “.

10. itsfoss.com · bash-scripting-tutorialBash Scripting Tutorial for Beginners - It's FOSS

    itsfoss.com · bash-scripting-tutorial

    

    Jul 4, 2023 · 1. Writing your first bash shell script. Create a new file named hello.sh: nano hello.sh. This will open the nano editor in the terminal. Enter the following lines to it: #!/bin/bash echo "Hello World" Save and exit the nano editor by pressing the Ctrl+X key. Now, you can run the bash shell script in the following manner: bash hello.sh

11. opensource.com · 1 · getting-started-shell-scriptingGetting started with shell scripting - Opensource.com

    opensource.com · 1 · getting-started-shell-scripting

    

    Jan 16, 2017 · $ echo "#\!/bin/sh" > hello.sh. $ echo "echo 'hello world' " >> hello.sh . As you can see, writing a shell script consists, with the exception of the first line, of echoing or pasting commands into a text file. To run the script as an application: $ chmod +x hello.sh. $ ./hello.sh. hello world. And that's, more or less, all there is to it!