[OT] writing filters in sh

[Chip Camden]

Quoth John Levine on Thursday, 28 October 2010:
> >I was hoping for a generalized, simple idiom for this, rather than
> >needing to implement it myself, for demonstration purposes
> 
> ----------------------------------------
> #!/bin/sh
> 
> cat "$@" | 
> while read x
> do
>    echo "I saw $x"
> done
> ----------------------------------------
> 
> Sheesh.
> 
> R's,
> John
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<stage_direction>Smacks forehead as if starring in a V-8 commercial</stage_direction> 

And of course, if the script does input in more than one place, you can
enclose the entire section in parentheses after the pipe:

cat "$@" | (
    read x
    ...
    read y
    ...
    select ans in a b c; do break; done
)

-- 
Sterling (Chip) Camden    | sterling at camdensoftware.com | 2048D/3A978E4F
http://camdensoftware.com | http://chipstips.com        | http://chipsquips.com
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