Using `date` command to get previous, current and next month

Question

I am using below to get previous, current and the next month under Ubuntu 11.04:

LAST_MONTH=`date +\'%m\' -d \'last month\'`
NEXT_MONTH=`date +\         


        

Answer 1

the main problem occur when you don't have date --date option available and you don't have permission to install it, then try below -

Previous month
#cal -3|awk 'NR==1{print toupper(substr($1,1,3))"-"$2}'
DEC-2016 
Current month
#cal -3|awk 'NR==1{print toupper(substr($3,1,3))"-"$4}'
JAN-2017
Next month
#cal -3|awk 'NR==1{print toupper(substr($5,1,3))"-"$6}'
FEB-2017