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     • A command line interface (CLI) is a computer program that runs on text-based inputs to execute different tasks. Instead of pointing and clicking with a mouse, it receives single-line commands that interact with system elements like file management.
     www.g2.com › articles › command-line-interface

     What Is Command Line Interface (CLI)? How to Use It - G2

2. Top results related to how do command-line interfaces function?

   • How do I pass a command line argument to an Octave function when calling function from the command line interpreter?

     Top Answer

     Answered Jan 07, 2019 · 3 votes

     The best way would be using two separated files:

     % somescript.margs = argv();printf("args = %s\n", args{1});somefunc(args{1});printf("this is the end\n");%somefunc.mfunction somefunc(func_arg) printf("hello world\n"); printf("func_arg=%s\n",func_arg)endfunction

     Then, from your OS command line:

     $ octave-cli somescript.m someargargs = somearghello worldfunc_arg=someargthis is the end

     and from Octave command line:

     octave:2> somefunc("somearg")hello worldfunc_arg=somearg-

     Notice that in your example, as the function name matches the source file name, you will be calling the function inside the source and the last part of the code (i.e. "this is the end") would never be reached .

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     1/5

   • How do I return a value when @click.option is used to pass a command line argument to a function?

     Top Answer

     Answered Oct 08, 2014 · 13 votes

     Unfortunately, what you're trying to do doesn't make sense. Command-line programs can have an exit code, but that's just a small integer; they can't return text, or arbitrary Python objects.

     There's a quasi-standard for what these integers means; the simple version is 0 for success, 1 for most errors, 2 for invalid command-line arguments. click is trying to make your function into a good command-line citizen, so when you exit your function, it calls sys.exit with the appropriate number (0 if you return, 1 if you raise, and 2 if it failed to parse your arguments).

     So, whatever you return has no effect, and whatever you try to do with the return value at the top level doesn't even get run.

     What programs usually do when they need to "return" text is to print it to standard output, which is exactly what click.echo is for.

     Other Answers

     Answered Feb 25, 2022 · 5 votes

     By default, click converts your program into a command-line program, i.e. it executes the click command and exits with a return code. Thus your program executes hello and finishes:

     import click-@click.command()@click.option('--count', default=3, help='Number of greetings.')def hello(count): """Simple program that greets NAME for a total of COUNT times.""" for x in range(count): click.echo('Hello') return "hello hi"if __name__ == '__main__': print(hello())

     It prints:

     HelloHelloHello

     You can change this behaviour by passing the argument standalone_mode=False (Click API Commands):

     import click-@click.command()@click.option('--count', default=3, help='Number of greetings.') def hello(count): """Simple program that greets NAME for a total of COUNT times.""" for x in range(count): click.echo('Hello') return "hello hi"if __name__ == '__main__': print(hello(standalone_mode=False))

     It prints:

     HelloHelloHellohello hi

     Other Answers

     Answered Feb 11, 2021 · 2 votes

     After looking through click's source code/reference I stumbled across the main() method of BaseCommand which takes the parameter, standalone_mode, that allows you to return values if disabled (it is True by default). Hope this helps someone in the future.

     Setup code:

     import sysimport click-@click.group(invoke_without_command=True)@click.option('--option1')@click.argument('arg1')def main(option1, arg1): class SpecialObject(): def __init__(self, option, arg): self.option = option self.arg = arg def __repr__(self): return str(self.option)+str(self.arg) return SpecialObject(option1, arg1)@main.command()def subcmd(): return [4,5,6]

     Test code:

     if __name__ == "__main__": commands = ( ["--help"], ["arg_val",], ["--option1","option1_val","arg1_val"], ["arg_val","subcmd"], ["arg_val","subcmd", "--help",], ) print(f'Click Version: {click.__version__}') print(f'Python Version: {sys.version}') for cmd in commands: print('-----------') print(f'Starting cmd:{cmd}') ret_val = main.main(cmd, standalone_mode=False) print(f"Returned: {type(ret_val)}, {ret_val}\n"

     Output:

     $ python __main__.pyClick Version: 7.1.2Python Version: 3.9.1 (default, Dec 11 2020, 09:29:25) [MSC v.1916 64 bit (AMD64)]-----------Starting cmd:['--help']Usage: __main__.py [OPTIONS] ARG1 COMMAND [ARGS]...Options: --option1 TEXT --help Show this message and exit.Commands: subcmdReturned: <class 'int'>, 0-----------Starting cmd:['arg_val']Returned: <class '__main__.main.<locals>.SpecialObject'>, Nonearg_val-----------Starting cmd:['--option1', 'option1_val', 'arg1_val']Returned: <class '__main__.main.<locals>.SpecialObject'>, option1_valarg1_val-----------Starting cmd:['arg_val', 'subcmd']Returned: <class 'list'>, [4, 5, 6]-----------Starting cmd:['arg_val', 'subcmd', '--help']Usage: __main__.py subcmd [OPTIONS]Options: --help Show this message and exit.Returned: <class 'int'>, 0

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     2/5

   • How do I call a specific python function in a file from the command line?

     Top Answer

     Answered Aug 15, 2017 · 11 votes

     You could either call python with the command option:

     python -c "from file_name import function;function()"-

     or if you want this function to be called every time you execute the script you could add the line

     if __name__ == "__main__": function()

     This will then only execute this function if the file is executed directly (i.e. you can still import it into another script without "function" being called).

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     3/5

   • How do command line arguments work?

     Top Answer

     Answered Feb 21, 2012 · 10 votes

     I'll try to explain the implementation a bit more than other answers. I'm sure there are inaccuracies, but hope it describes the relevant parts well enough.

     Under the shell, you type ./myprog a b c. The shell parses it, and figures out that you want to run ./myproj with three parameters. It calls fork, to create a new process, where ./myprog would run. The child process, which still runs the shell program, prepares an array of 5 character pointers. The first will point to the string ./prog, the next three are to the strings a, b and c, and the last is set to NULL. Next, it calls the execve function, to run ./myprog with the parameter array created. execve loads ./myprog into memory, instead of the shell program. It releases all memory allocated by the shell program, but makes sure to keep the parameter array. In the new program, main is called, with the parameter array passed to it as argv.

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     4/5

   • How do you continue a command on the next line (not 'how do I write a multi-line command')

     Top Answer

     Answered Jan 26, 2017 · 10 votes

     In Powershell, SHIFT + ENTER takes you to the new line.

     Hope this helps.

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     5/5

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3. www.freecodecamp.org › news › how-to-use-the-cliHow to Use the Command Line Interface – for Beginners

   www.freecodecamp.org › news › how-to-use-the-cli

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   Sep 27, 2022 · The Command Line Interface (CLI) is an editing environment that is text-based. It uses specified text (known as commands) to interact with the computer and perform numerous operations, including installing and working with programs.

4. People also ask

   What is a command line interface?

   • The command line interface is most commonly used for system administration tasks, such as: A command line is a mixture of prompts and commands. The prompt is present at the start of every command line and ends with a $ or %. A command is a thing that tells your system what you want it to do.

   What Is Command Line Interface (CLI)? How to Use It - G2

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   What is a command line interface (CLI)?

   • The command line interface (or CLI for short) is similar to DOS in that it uses commands to perform various operations, like creating files, creating folders, installing programs, and what have you. The advancement of technology over the years brought about the popular GUI (Graphical User Interface) and made Operating Systems less stressful to use.

   How to Use the Command Line Interface – for Beginners - freeCodeCa…

   www.freecodecamp.org/news/how-to-use-the-cli-beginner-guide/

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   Which operating system has a command line interface?

   • Most operating systems have two types of interfaces: command line interface and graphical user interface (GUI). While the latter is more common as the default interface in operating systems like Windows, Linux, and macOS, a Unix-based system offers both CLI and GUI. Programming languages like Python also support command line interfaces.

   What Is Command Line Interface (CLI)? How to Use It - G2

   www.g2.com/articles/command-line-interface

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   What are the advantages of using a command-line interface (CLI)?

   • There are several advantages to using a command-line interface (CLI). The most notable are: Speed: CLI enables you to execute commands quickly. You can combine multiple commands into a single line of text to run your program. This is much faster than navigating through menus with a GUI.

   What Is a Command Line Interface? (CLI Definition) | Built In

   builtin.com/software-engineering-perspectives/command-line-interface

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5. www.g2.com › articles › command-line-interfaceWhat Is Command Line Interface (CLI)? How to Use It - G2

   www.g2.com › articles › command-line-interface

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   Apr 24, 2024 · A command line interface (CLI) is a computer program that runs on text-based inputs to execute different tasks. Instead of pointing and clicking with a mouse, it receives single-line commands that interact with system elements like file management.

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7. www.geeksforgeeks.org › what-is-command-lineWhat is Command Line Interface (CLI)? - GeeksforGeeks

   www.geeksforgeeks.org › what-is-command-line

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   Mar 18, 2024 · An interface that is text-based and used to enter instructions that communicate with an operating system on a computer is called a command line interface (CLI). The default shell, which stands between the user and the operating system, assists the CLI in its operations.

8. en.wikipedia.org › wiki › Command-line_interfaceCommand-line interface - Wikipedia

   en.wikipedia.org › wiki › Command-line_interface

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   A command-line interface (CLI) is a means of interacting with a computer program by inputting lines of text called command-lines. Command-line interfaces emerged in the mid-1960s, on computer terminals , as an interactive and more user-friendly alternative to the non-interactive interface available with punched cards .

9. www.freecodecamp.org › news › command-line-for-beginnersCommand Line for Beginners – How to Use the Terminal Like a ...

   www.freecodecamp.org › news › command-line-for-beginners

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   Apr 5, 2022 · In this article I'll try my best to simply explain the parts that make up the command line interface, and the basics of how it works, so you can start using it for your daily tasks. Let's go! =D. Table of Contents. Difference between console, terminal, command line (CLI) and Shell. Console; Terminal; Shell; Command line (CLI)

10. builtin.com › command-line-interfaceWhat Is a Command Line Interface? (CLI Definition) - Built In

    builtin.com › command-line-interface

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    Mar 1, 2023 · The command-line interface (CLI) accepts commands by entering text on a keyboard. Different CLIs have different syntaxes, but they can all essentially perform the same operations. Once you run the command, the computer interprets the command and executes the appropriate actions.

11. www.codecademy.com › article › command-line-interfaceCommand Line Interface - Codecademy

    www.codecademy.com › article › command-line-interface

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    The command line interface is a program on your computer that allows you to create and delete files, run programs, and navigate through folders and files. On a Mac, it’s called Terminal, and on Windows, it’s Command Prompt.