[J3] execute_command_line error condition clarification

[Daniel Chen]

Hello,

The standard says the following about the CMDSTAT​ argument of intrinsic EXECUTE_COMMAND_LINE.
```

CMDSTAT (optional) shall be a scalar of type integer

….

a processor-dependent positive value if an error condition occurs,

…

Otherwise it is assigned the value 0.

```

What is considered as an “error condition” in this context?

Consider the following sample code:
```
         integer :: e = 0
        integer :: c = 0

        call execute_command_line("cat nofile", exitstat=e, cmdstat=c)

        print *, e
        print *, c
      end
```

Should “cat nofile” be considered as an error condition if “nofile” doesn’t exist?

Thanks,
Daniel
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