seekable stdin

[Michael Gale]

Hello,

	Thanks for the info .. could I just use the seek command in bash. 
According to a `man seek`

doing a `seek STDIN 0 start` should reset STDIN to the beginning for me 
.. what do you think ?

Do you see any problems ? Does any one see any problems ?

Michael.



Gyepi SAM wrote:
> On Mon, Dec 06, 2004 at 06:03:06PM -0500, David Relson wrote:
> 
>>Reading stdin twice isn't doable, AFAIK.  I use "cat > tmp.$$" to create
>>a file and then use that.
> 
> 
> Actually reading stdin twice *is* doable, if stdin points to a seekable file.
> The filter looked like it was written for postfix, which, as I recall, does
> write the message to disk and dups the filter stdin to the file handle, so
> stdin *should* be seekable, but it's probably not portable to depend on it.
> 
> Nonetheless, rewind(3) or seek(3) would do the trick, but the latter should be
> preferred since has a return value.
> 
> In a shell script, the easy option is to say: 
>  
> perl -e 'seek(STDIN, 0, 0) or die "cannot seek stdin. $!\n"'
> 
> I have a C version knocking around if perl is too slow ;)
> 
> -Gyepi
> 
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-- 
Michael Gale
Lan Administrator
Utilitran Corp.

Linux: because a PC is a terrible thing to waste !!!