Question

I am having a situation for which I am looking for some suggestion.

Suppose I write a program which prints the directory names of the directories.
Is it possible to convert this program into a command (just on my system).
Not be alias but via C only.

Answer 1

As long as the file is executable (has the exec x access for the user starting it) and can be seen from the command interpreter (usually bash or sh), you can consider it to be a command.

There will be no difference in running your own file from your path than the ls command for instance.

Also, the C (or C++ …) language is not a requirement. There are plenty of commands in, for instance, /usr/bin that are a script, meaning they’re sh or bash (or even perl)…

• access Ensure the file has the x access right (e.g. chmod u+x file)
• path Ensure the file is in your PATH, or add an entry in your path (for instance) with PATH=$PATH:mypath
• test Test it well before to put it in a path from which other users may have access