The realpath command line utility

I seem to use my command line utility realpath all the time. All it does it take a relative path and return its absolute path. It is very useful. So useful that I can't believe all systems don't have one in /usr/bin/. If you are missing this functionality too then here is source
#include <stdio.h>
#include <limits.h>
#include <stdlib.h>

int main( int argc, char** argv ) {

int i;
char _realpath[ PATH_MAX ];

for ( i = 1; i < argc; i++ ) {
if ( realpath( argv[i], _realpath ) != NULL ) {
printf( "%s\n", _realpath );
else {
exit( 1 );
exit( 0 );
Save this to the file realpath.c and then build with make realpath.