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Character Class ?

Character Class ?

Character Class ?

(OP)
I am having a problem understanding how the character classes work using Posix. I am trying to extract a single digit from a string as follows:

   rowa='1 2 3 4 5'
   rowb=`echo $rowa | awk '{print $1,$2,$3,$4,$5}'
         for i in "$rowb"
             do
                if [ "${i+[3[:digit:]} = "3" ]    # <- This returns 1
                    then
                           echo $i
fi
done

RE: Character Class ?

Looks like a Unix question and this is a C forum

Cheers,
Dian

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