rpm check script problem

[赵方杰]

"exec 9<$filename"  means "redirect file to fd9, without dealing with fd0".

2006/10/9, Tony Nelson <tonynelson at georgeanelson.com>:
> At 11:46 PM +0800 10/9/06, ???? wrote:
>
> >2006/10/9, Dan Track <dan.track at gmail.com>:
> >> Hi
> >>
> >> I've got a script that should check which rpms are installed on the
> >> system. Part of the script involves using file descriptors. I'm having
> >> trouble understanding these file descriptors and was hoping someone
> >> can clarify my mistake. As a simple script I wrote the following:
> >>
> >> #!/bin/bash
> >> $filename=$1
> >> $filename1=$2
> >>
> >> exec 9<&0 < $filename
>
> >The line in the script "exec 9<&0 <$filename" means "first copy fd0 to
> >fd9, then redirect file to fd0", so in the following lines of the
> >script fd9 is always the stdin.
>
> According to the Wikipedia link
>
>     exec 9<$filename
>
> seems more likely.
> --
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