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Shell Programming and Scripting

Value validation

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# 15  
Old 01-21-2014
Slightly longer than a magical awk but perhaps more readable and/or flexible depending what you want to do next:-
Code:
while read label val
do
   valtest="${val%${val##?}}"                  # Get first character of value

   case "$valtest" in
      "-")   echo "$label Negative value"   ;;
      "#")   echo "$label Invalid value"    ;;
      [0-9]) echo "$label $val"             ;;
      "")    echo "$label No value"         ;;
      *)     echo "$label Unexpected value" ;;
   esac

done < file

I hope that this helps. I've tested in on HP-UX 11.11, RHEL 6.1 & AIX 4.3.3 to 6.1



Robin
Liverpool/Blackburn
UK
# 16  
Old 01-21-2014
No joy, I have tried it and it is not producing any output
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