how to create UNIX / Linux commands? [closed]

Question

I'm looking to create my own Unix/ Linux commands using C programming. Say for example .. I wrote simple file copy program, I'd like to make it as a Unix/ Linux command.

How do I do it ?

Answer 1

Any executable file placed in a directory that is in the PATH (shell) variable will be a Unix command.

Answer 2

1. Write your code using stdin, stdout and stderr in order to allow executing it from the command line and pipe its output
2. Parse command line arguments and use them (if you need)
3. Compile the binary
4. Locate in any directory in the PATH (e.g. /usr/sbin)