# Tahir Hassan's Blog

My Technical Notes

## Friday, 23 January 2015

### Making Fsi.exe callable on the command line

There are multiple ways of doing this. Below is the method I prefer:

• First create a folder in which you will store your commandline application shortcuts. I am going to call the folder pathlinks.
• In your pathlinks folder, add a bat file called fsi.bat and include the following code:

@"C:\Program Files (x86)\Microsoft SDKs\F#\3.1\Framework\v4.0\Fsi.exe" %*


@ suppresses echoing the command to the invoking shell. The quotations "" prevent white space being interpreted as argument delimiters. %* pastes any arguments to the batch file, to the quoted executable instead.

• Lastly, we include the pathlinks folder on the PATH environment variable. We can do this two ways:
• Open Regedit.exe as administrator and add C:\...\pathlinks to PATH in either of the following "folders":


HKEY_CURRENT_USER\Environment

If you want to change the current users's path, or

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment

If you want to change the machine's path.

• An alternative way, is to execute in an administrator-privileged cmd:


You can add the -m argument if you want to change the machine's path variable. Otherwise leave it out to change the user's path variable. One issue with this is that it truncates PATH to 1024 characters, so the above method might be better.
You can then execute fsi on the command line and it will be interpreted to fsi.bat.