Setting the date.

Shell Programming and Scripting
1

I am modifying some script and need to have the script reflect the current date. I have the script below. In the section yy="2010",mm="07", dd="12" What would I need to change to have the script automatically input the current year month & date instead of manually updated the script daily?

  
  yy="2010"
  mm="07"
  dd="12"

 

  for hh in 00 06 12 18; do

      

      ${PGM}/file -i${dir}/file2_${yy}-${mm}-${dd}_${hh}:00:00 

      cat file.BIN >> file2km.${yy}${mm}${dd}00

  done 
  rm -f FILE.BIN
2 
  PGM="/share/apps/hysplit/exec"
  dir="/share/huina/rhuff/hysplit/wrf"

  eval$(date '+yy=%Y mm=%m dd=%d')
  #yy="2010"
  #mm="07"
  #dd="12"
3

How exactly would I write that? Would I eliminate

  #yy="2010"
  #mm="07"
  #dd="12"

and simply write

eval$(date '+yy=%Y mm=%m dd=%d')

Or would I write

#yy=%Y
#mm=%m
#dd=%d

Is there any reason why Y is uppercase?