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Full Discussion: Value validation
Top Forums Shell Programming and Scripting Value validation Post 302884618 by rbatte1 on Tuesday 21st of January 2014 06:17:48 AM
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
 

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LEARN ABOUT X11R4

ip-addrlabel

IP-ADDRLABEL(8)                                                        Linux                                                       IP-ADDRLABEL(8)

NAME

       ip-addrlabel - protocol address label management

SYNOPSIS

       ip addrlabel  { COMMAND | help }

       ip addrlabel { add | del } prefix PREFIX [ dev DEV ] [ label NUMBER ]

       ip addrlabel { list | flush }

DESCRIPTION

       IPv6 address labels are used for address selection; they are described in RFC 3484. Precedence is managed by userspace, and only the label
       itself is stored in the kernel.

   ip addrlabel add - add an address label
       add an address label entry to the kernel.

       prefix PREFIX

       dev DEV
              the outgoing interface.

       label NUMBER
              the label for the prefix.  0xffffffff is reserved.

   ip addrlabel del - delete an address label
       delete an address label entry from the kernel.  Arguments: coincide with the arguments of ip addrlabel add but the label is not required.

   ip addrlabel list - list address labels
       list the current address label entries in the kernel.

   ip addrlabel flush - flush address labels
       flush all address labels in the kernel. This does not restore any default settings.

SEE ALSO

       ip(8)

AUTHOR

       Manpage by Yoshifuji Hideaki /

iproute2                                                            20 Dec 2011                                                    IP-ADDRLABEL(8)
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