[ale] Baffled on doing CASE statement with a Variable list of values

[Ed Cashin]

I bet you only get the cases evaluated during the script's parsing.  I
haven't checked that, though.

I think this would be a better place for using grep, not case.  Using "-F"
has the additional advantage that you turn off globbing and regular
expressions, since you seem to want to match fixed strings exactly.

$ cat /tmp/allowed

one

two

three

$ if echo two | grep -Ff /tmp/allowed > /dev/null 2>&1; then echo match; fi

match

$

On Mon, Aug 3, 2015 at 12:03 PM, Neal Rhodes <neal at mnopltd.com> wrote:

> Exactly how does not assign a list of values separated by pipe to use that
> variable later on in a script and make a CASE statement happy?
> The script below shows a variety of attempts.
>
> Ultimately, we're aiming to grab the list from a file, eg "LIST="`cat
> allow.list`"
>
>
> REMOTE_ADDR=one
>
> case $REMOTE_ADDR in
>         one|two|three) echo "I like $REMOTE_ADDR" ;;    # Picks this one.
>         *) echo "I do NOT like $REMOTE_ADDR" ;;
> esac
>
> LIST="one|two|three"
> case $REMOTE_ADDR in
>         $LIST) echo "But now I like $REMOTE_ADDR" ;;
>         *) echo "But now I do NOT like $REMOTE_ADDR" ;; # Picks this one.
> esac
>
> case $REMOTE_ADDR in
>         "$LIST") echo "And I like $REMOTE_ADDR" ;;
>         *) echo "And I do NOT like $REMOTE_ADDR" ;;     # Picks this one.
> esac
>
> LIST="one"
> case $REMOTE_ADDR in
>         "$LIST") echo "Yet I like $REMOTE_ADDR" ;;      # Picks this one.
>         *) echo "Yet I do NOT like $REMOTE_ADDR" ;;
> esac
>
> LIST="one\|two\|three"
> case $REMOTE_ADDR in
>         $LIST) echo "However now I like $REMOTE_ADDR" ;;
>         *) echo "However now I do NOT like $REMOTE_ADDR" ;;     # Picks
> this one.
> esac
>
>
>
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-- 
  Ed Cashin <ecashin at noserose.net>
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