awk or substr

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1

i have a variable 200612
the last two digits of this variable should be between 1 and 12, it should not be greater than 12 or less than 1 (for ex: 00 or 13,14,15 is not accepted)
how do i check for this conditions in a unix shell script.

thanks
Ram

2

Nevemind; misread question.

Carl

3 
[[ ${var#????} -lt 13 ]] && [[ ${var#????} -gt 0 ]] 
....
4 
var=200612
last2=${var#"${var%??}"}
if [ ${last2#0} -lt 1 ] || [ ${last2#0} -gt 12 ] 
then
   printf "INVALID %s\n" "$var" >&2
fi