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This is one of the first samples in Mac OS X Developer Library. I found it in Cocoa Fundamental Guide

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])

{

    @autoreleasepool {

        

        NSArray *param = [[NSProcessInfo processInfo] arguments];

        NSCountedSet *cset = [[NSCountedSet alloc] initWithArray:param];

        NSArray *sorted_args = [[cset allObjects]

                                sortedArrayUsingSelector:@selector(compare:)];

        NSEnumerator *enm = [sorted_args objectEnumerator];

        id word;

        while (word = [enm nextObject]) {

            printf("%s\n", [word UTF8String]);

        }

        

        [cset release];

        

    }

    return 0;

}

here is the Terminal Window:

I payed attention on this sample, because it shows a useful trick: how to sort and enumerate data, for example an NSDictionary object.