What are the analogues of _getch, strcat(), strcmp(), strcpy(), system(cls) for Linux?

Question

linux

What are the analogues of _getch, strcat(), strcmp(), strcpy(), system(cls) for Linux?

Answer 1

These functions do not need analogues. These are the main functions of C.
man getchar
man strcpy
man system
By the way, system() is a frankly stupid function, it is better to use execve() instead.
The fact that they do not work for you does not mean at all that you need to look for analogues for them. Please provide the error log.

Answer 2

man libc