Commandline Arguments¶

`main()` Can Take Parameters ¶

So far: int main(void)

A process has an exit status ⟶ implicitly int main(...)
⟶ compiler magic: main() is special
C++: compiler error if main() does not return an int
No commandline arguments expected ⟶ main(void)

⟶ How are commandline arguments passed?

Commandline Arguments ¶

int main(int argc, char **argv)
{
    char *opt = argv[1]; /* "-l" */
    char *dir = argv[2]; /* "/tmp" */
    ...
}

ls -l /tmp

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