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Learn Red ? Fundamentals of Red
book

Learn Red ? Fundamentals of Red

by Ivo Balbaert
May 2018
Beginner content levelBeginner
252 pages
6h 19m
English
Packt Publishing
Content preview from Learn Red ? Fundamentals of Red

Getting input from command-line arguments

Command-line arguments are captured in the system/script/args word. It is one string in which all arguments are stored, separated by a space:

;-- see Chapter10/args.red:print system/script/args           ;== "78 A Red"type? system/script/args           ;== string!args: split system/script/args " " ;== ["78" "A" "Red"]print ["Number of command-line arguments:" length? args]                                   ;== Number of command-line arguments: 3foreach arg args [    print arg]; 78; A; Red

We can use split to obtain the separated arguments in an args series, and start using them.

To see the output, start the program with red args.red 78 A Redor after compiling with red -r, start it with: ./args 78 A Red .

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Publisher Resources

ISBN: 9781789130706Supplemental Content