: !/bin/sh # MMYYYY month=$1 #echo "$month" #exit YYYY=`echo "$month" | awk '{ print substr($1,3,4) }'` MM=`echo "$month" | awk '{ print substr($1,1,2) }'` awk -v "MM=$MM" -v "YYYY=$YYYY" 'BEGIN { if ( ++MM > 12 ) { MM = 1 ++YYYY } printf("%02d%04d\n", MM, YYYY) exit }' exit