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#include <stdlib.h>
#include <limits.h>
...
    printf("execname: %s\n", execname);
    printf("realpath: %s\n", execpath);
}

 
$ ./bar
execname: bar
realpath: /home/ck/myscripts/bar

$ ./bar
execname: /home/ck/bin/foo
realpath: /home/ck/bin/foo