F# Interactive Options

This topic describes the command-line options supported by F# Interactive, fsi.exe. F# Interactive accepts many of the same command line options as the F# compiler, but also accepts some additional options.

Using F# Interactive for Scripting

F# Interactive, fsi.exe, can be launched interactively, or it can be launched from the command line to run a script. The command line syntax is

fsi.exe [options] [script-file [arguments] ]

The file extension for F# script files is fsx.

Table of F# Interactive Options

The following table summarizes the options supported by F# Interactive. You can set these options on the command-line or through the Visual Studio IDE. To set these options in the Visual Studio IDE, open the Tools menu, select Options..., then expand the F# Tools node and select F# Interactive.

Where lists appear in F# Interactive option arguments, list elements are separated by semicolons (;).

Option	Description
--	Used to instruct F# Interactive to treat remaining arguments as command line arguments to the F# program or script, which you can access in code by using the list fsi.CommandLineArgs.
--checked[+|-]	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--codepage:<int>	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--crossoptimize[+|-]	Enable or disable cross-module optimizations.
--debug[+|-] --debug:[full|pdbonly] -g[+|-] -g:[full|pdbonly]	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--define:<string>	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--exec	Instructs F# interactive to exit after loading the files or running the script file given on the command line.
--fullpaths	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--gui[+|-]	Enables or disables the Windows Forms event loop. The default is enabled.
--help -?	Used to display the command line syntax and a brief description of each option.
--lib:<folder-list> -I:<folder-list>	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--load:<filename>	Compiles the given source code at startup and loads the compiled F# constructs into the session. If the target source contains scripting directives such as #use or #load, then you must use --use or #use instead of --load or #load.
--mlcompatibility	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--noframework	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#)
--nologo	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--nowarn:<warning-list>	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--optimize[+|-]	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--quiet	Suppress F# Interactive's output to the stdout stream.
--readline[+|-]	Enable or disable tab completion in interactive mode.
--reference:<filename> -r:<filename>	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--tailcalls[+|-]	Enable or disable the use of the tail IL instruction, which causes the stack frame to be reused for tail recursive functions. This option is enabled by default.
--use:<filename>	Tells the interpreter to use the given file on startup as initial input.
--utf8output	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--warn:<warning-level>	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--warnaserror[+|-]	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).
--warnaserror[+|-]:<int-list>	Same as the fsc.exe compiler option. For more information, see Compiler Options (F#).

Related Topics

Title	Description
Compiler Options (F#)	Describes command line options available for the F# compiler, fsc.exe.