#include <unistd.h>
#include <stdio.h>
#include <limits.h>

int main() {
   char cwd[PATH_MAX];
   if (getcwd(cwd, sizeof(cwd)) == NULL) {
      perror("getcwd");
      return 1;
   }

   printf("Current working dir: %s\n", cwd);

   return 0;
}

##</code><code>##

[~/sym1]$ gcc -Wall -Wextra -pedantic a.c -o a && ./a
Current working dir: /home/ikegami/dir1

##</code><code>##

[~/sym1]$ readlink /proc/$$/cwd
/home/ikegami/dir1

##</code><code>##

#include <unistd.h>
#include <stdio.h>
#include <limits.h>

int main() {
   if (chdir("/home/ikegami/sym1")) {
      perror("chdir");
      return 1;
   }

   char cwd[PATH_MAX];
   if (getcwd(cwd, sizeof(cwd)) == NULL) {
      perror("getcwd");
      return 1;
   }

   printf("Current working dir: %s\n", cwd);

   return 0;
}

##</code><code>##

[~/sym1]$ gcc -Wall -Wextra -pedantic a.c -o a && ./a
Current working dir: /home/ikegami/dir1

##</code><code>##

use 5.010;
use Path::Tiny qw( path );
say path($0)->absolute($ENV{PWD});

##</code><code>##

[~/sym1]$ perl a.pl
/home/ikegami/sym1/a.pl