standard redirections

standard redirections

[César Soler]

Hi all,

I would like to run an interactive script, but I'm a bit lost.
Is there any way to read a value from the keyboard when the standard
input has been assigned to a file into a sh-script? It means, into a
script I have a while loop, like:

cat $file | while read line;do
    [commands]

    echo "Continue(y/n)?"
    read cont
    if [ "$cont" = "n" ];then exit 1;fi
    
    [more commands]
done

In this way, cont is read from $file. Does anybody know how I could
redirect again de standard input?

Thanks in advance for your help!

-- 
Best regards,
 César                          mailto:csoler@euskalnet.net


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Re: standard redirections

[John Hallam]

On most UNIX systems /dev/tty is the name for the "controlling terminal"
of the process (i.e. the one where you typed in the command -- this is not
a precise definition of controlling terminal of course) so if you arrange
to read from /dev/tty you will be talking to the terminal not the file.
Look at man 4 tty for another description of this.

		read cont < /dev/tty

works for me with bash.

	John.

On Fri, 17 May 2002, César Soler wrote:

> Hi all,
>
> I would like to run an interactive script, but I'm a bit lost.
> Is there any way to read a value from the keyboard when the standard
> input has been assigned to a file into a sh-script? It means, into a
> script I have a while loop, like:
>
> cat $file | while read line;do
>     [commands]
>
>     echo "Continue(y/n)?"
>     read cont
>     if [ "$cont" = "n" ];then exit 1;fi
>
>     [more commands]
> done
>
> In this way, cont is read from $file. Does anybody know how I could
> redirect again de standard input?
>
> Thanks in advance for your help!
>
> --
> Best regards,
>  César                          mailto:csoler@euskalnet.net
>
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-admin" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

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Re: standard redirections

[César Soler]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Fri, 17 May 2002, John Hallam wrote:

> On most UNIX systems /dev/tty is the name for the "controlling terminal"
> of the process (i.e. the one where you typed in the command -- this is not
> a precise definition of controlling terminal of course) so if you arrange
> to read from /dev/tty you will be talking to the terminal not the file.
> Look at man 4 tty for another description of this.
> 
> 		read cont < /dev/tty
> 
> works for me with bash.
> 
> 	John.
> 
Thank you very much for your help and your time, as well as Tims'.
This also works in my case!

- -----------------------------------------------------------------------------
César Soler                                      mailto: csoler@euskalnet.net

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