![• Code
– Command Line
• "C:Program Files (x86)Microsoft
Shell Scripting With F#
F#v4.0Fsi.exe" --exec <name of .fsx>
<args>
• Args are passed as array of strings
• args.[0] is name of script; actual args start at
args.[1]
• Last line of fsx invokes main func and
passes commandline args:
– main fsi.CommandLineArgs;;](https://image.slidesharecdn.com/shellscriptingwithf-130418122720-phpapp02/85/Shell-scripting-with-f-10-320.jpg)
Shell scripting with f
- 1. Onorio Catenacci Shell Scripting With F#
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- 4. • What We’ll Discuss – Important Background Shell Scripting With F# – Use cases – Code – Additional resources
- 5. • Important Background – Shell Scripting • Want It Lightweight Shell Scripting With F# – Rapid testing/prototyping – REPL • Often driving apps via command-line • Want One Language For All • Shell Scripting Languages – Cmd – VBScript – Powershell – Bash
- 6. • Important Background – Functional Programming Immutable data by default (ex. 1, 2) Shell Scripting With F# • • Lambda functions (ex. 3) • Functions are “first class” (ex. 4,5,6) • Currying/partial application vs. tupled parameters (ex. 7,8, 9) • Unit type (ex. 10) • All functions return a value
- 7. • Important Background – F# • ML language family Shell Scripting With F# – Standard ML – OCaml • Indentation sensitive by default • Types of values are inferred from usage • Some/None • |> (Pipe Forward) • All funcs must be declared before use
- 8. • Why Write A Shell Script? – Wrap functionality which you can’t change Shell Scripting With F# – Automate common operations – Large batch jobs
- 9. • Why Use F# For Shell Scripting? – One language which scales Shell Scripting With F# – Low ceremony • Type inference – Default immutability – Good way to practice FP – Free to choose your own for shell scripting
- 10. • Code – Command Line • "C:Program Files (x86)Microsoft Shell Scripting With F# F#v4.0Fsi.exe" --exec <name of .fsx> <args> • Args are passed as array of strings • args.[0] is name of script; actual args start at args.[1] • Last line of fsx invokes main func and passes commandline args: – main fsi.CommandLineArgs;;
- 11. • Additional Resources – Chris Smith’s “Scripting In F#” Shell Scripting With F# • http://blogs.msdn.com/b/chrsmith/archive/2008/09/ 12/scripting-in-f.aspx – Programming F# 3.0 • Chapter on F# Shell Scripting and Common Idioms – Fake (F# Make Files) (Steffen Forkmann) • https://github.com/forki/FAKE – Finnikin (F# Shell Scripting Utility Library) • https://github.com/OnorioCatenacci/finnikin