When we do so, the program has access to the argument or arguments through the ARGV array. ARGV is short for "argument vector. Now when we do the following: ruby hello. So how exactly does ARGV work? As we can see, ARGV is an array that has all the arguments we included when we executed our script. One interesting thing to note: the arguments have all been converted to strings. The terminal will output Hello. You are years old! For instance, we could loop through the array which is common or even remove elements from it.
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Jordan Running Jordan Running Sometimes, the PowerShell execution policy is set to restricted. In this case, you will not be able to execute commands or scripts through PowerShell… unless you just set it to unrestricted using the following command:.
The final version of Visual Basic has come standard on Windows machines since The following script can download a file of your choosing.
However, the script is quite larger than the PowerShell one. Cscript is a command line Windows Script Host that allows you to pass command line options and allows you to set script properties.
It is not necessary to use this to run a vbs script in Windows 7 and possibly others, but using it allows your scripts to run on Windows XP machines and above. The following four languages are non-native to windows machines. However, if you find a machine with any of these languages installed on them regardless of the OS , you can leverage these scripts to download files. Perl is an extremely versatile scripting language that can be used for almost anything.
Using Perl makes it super easy to download files onto the local host. Python is a general purpose scripting language that emphasizes code readability. As with most scripting languages, the goal is to write less code than needed for a programming language, while still accomplishing the intended task.
Ruby is an object-oriented programming language that can be used for many things from creating frameworks think Metasploit to simple tasks such as downloading files. PHP is usually a server-side scripting language used for web development, but can also be used as a general purpose scripting language. The remaining ways to move files onto a target machine are through native operating system functions unless otherwise noted.
Some of these require more steps than others, but can be used in different scenarios to bypass certain restrictions. For this method, an attacker would want to echo the FTP commands to a bash script since it generally requires user interaction to input a username and password. First up, the above code is not very memory efficient, it loads the entire image into memory and then writes to disk.
It also turns out that open-uri has some other quirks. Notably, open-uri :. To solve all of this, Janko created the Down gem. It allows you to avoid these issues to safely and efficiently download files. We can download the image to a Tempfile using Down. If you want to save this file to the file system, Down has an option for that.
Passing a directory as a :destination option will save the file to that directory. This will give the downloaded file a random name generated by Tempfile. If you want to keep the name of the file from the URL you need to do a bit more work.
In this case we can download the file to a Tempfile and then move it to a permanent location on our drive. As you can see in the last example above, you can only pass in command line arguments from the actual command line not within IRB.
There is a trick you can sometimes use to check whether your script is being run from the command line or as part of a larger program instead. You might do so if you want to puts some stuff only if it's called from the CLI to debug it maybe. Despite learning all those options, there's one which is particularly easy. Most modern text editors have the options to "build" or run your code right in the editor. The specifics of how to do so are just a Google search away for your particular editor.
There are a number of different ways to run your Ruby scripts and it's good to give each of them a try before you settle on one as your "go-to". A little bit of investment in learning these things can quickly add up to minutes and even hours of time.
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