> Thank you.  It works now.  I had figured out how to take command line
> arguments, but needed the atoi() function to finish this off.
> 
> shell>  vi usleep.c
> 
> int main(int argc, char** argv) {
>   if ( argc > 1 )
>     usleep(atoi(argv[1]));
> }
> 
> shell>  make usleep
> shell>  cp usleep /usr/local/bin/
> shell>  usleep 250000 # sleep for a quarter second

Nice job :-)  Wanna make it slightly more robust? Me, bored? Don't 
mistake this for Good Code. Btw, every programmer places curly braces 
'{', whitespace and comments differently, and gets annoyed by every 
other programmer's standard. Strange, but true. ;-)


#include <stdio.h>

int main(int argc, char** argv)
   {
   if ( argc > 1 ) // is there an argument?
/*
  * Inline comments are yer bud, but beware of swiney editors that 
wordwrap your comments into syntax errors.
  * I hate it when that happens.
  * There are elegant ways to parse a command line, and this really
  * isn't one of them, fwiw.
  */
     {
     if (isdigit(argv[1][0])) // if arg smells like a number, just do it.
        {
        // using 'atol' instead of 'atoi', since we want a long
        usleep((unsigned long) atol(argv[1])); // cast result to ulong
        return(0); // say "goodnight" Dick.
        }
     if ((strncmp(argv[1],"--usage") == 0)) // like this'll happen...
        {
        printf("\nUsage: usleep [--usage] [microseconds]\n");
        return(0);
        }
     else   // this might happen...
        printf("\nusleep: bad argument %s: unknown option\n",argv[1]);
     return(-1);
     }
     // oh noes!!! They didn't give any argument!
     printf("\nUsage: usleep [--usage] [microseconds]\n");
     return(-1); // didn't check what or if usleep should ret on error.
   }

Steve
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