When a command is executed from the shell (ksh), its return value
may be obtained by command "echo $?". This return value is equal to the
error no (errno) if any of the system call in the executed command
fails.
The shell and the command executed are two different processes,
then how the return value (error) of the command is known to
shell.
Also, in most of the programs I have seen if any of the system call
fails the program exits  with 1. So, during exit() also we are not
telling anyone about the errno.

Thanx in advance for any help ....

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junky_fellow@yahoo.co.in wrote:

> When a command is executed from the shell (ksh), its return value
> may be obtained by command "echo $?". This return value is equal to the
> error no (errno) if any of the system call in the executed command
> fails.
> The shell and the command executed are two different processes,
> then how the return value (error) of the command is known to
> shell.
> Also, in most of the programs I have seen if any of the system call
> fails the program exits  with 1. So, during exit() also we are not
> telling anyone about the errno.
>
> Thanx in advance for any help ....

Is this a question or a political statement?

gtoomey

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