getenv

gistfile1.txt

#include <stdio.h>
#include <stdlib.h>

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

  static const char *env[] = {
    "HOME",
    "XDG_CACHE_HOME", "XDG_CONFIG_HOME", "XDG_DATA_HOME",
    "BIN_HOME",       "DEVEL_HOME",
  };

  int i = 0;
  while(env[i] != NULL) {
    printf("%20.20s: %s\n", env[i], getenv( env[i] ));
    i++;
  }

  return 0;
}

/* vim: set ts=2 expandtab sw=2: */