needle -filter

[Peter Rice]

Jan T. Kim wrote:
>     needle <file>:abc <file>:xyz
> 
> will not work with input streams. Perhaps, such capability could be
> implemented by defining some special name for the "standard input file"
> or "standard input database"? I haven't found such a thing in the USA
> specification, but perhaps, that's already invented?

There is a special name - stdin - but it can only be opened once.

How many Unix commands do read more than one input stream from stdin?

Peter