[C]同じ実行ファイルをシンボリックリンク名で使い分けるサンプルコード ref: https://qiita.com/pinebright/items/6eb5254e6d01bdebb46b

file1.sh

$ gcc main.c
$ ln -s a.out test_a
$ ln -s a.out test_b
$ ./test_a
test_a: called
$ ./test_b
test_b: called

main.c

#include <stdio.h>
#include <string.h>

struct command_list {
    char *command;
    int (*func)(int argc, char *argv[]);
};


static int test_a(int argc, char *argv[])
{
    printf("test_a: called\n");
    return (0);
}

static int test_b(int argc, char *argv[])
{
    printf("test_b: called\n");
    return (0);
}


static struct command_list list[] = {
    { .command = "test_a", .func = test_a },
    { .command = "test_b", .func = test_b },
    { .command = NULL,     .func = NULL   }
};


int main(int argc, char *argv[])
{
    int i;
    int ret = 0;

    for (i = 0; list[i].command != NULL; i++) {
        if (strstr(argv[0], list[i].command) != NULL) {
            ret = list[i].func(argc, argv);
        }
    }

    return (ret);
}

result.sh

$ gcc main.c
$ ln -s a.out test_a
$ ln -s a.out test_b
$ ./test_a
test_a: called
$ ./test_b
test_b: called