Create file with variable value in Unix

How can I create a file in unix or linux based on variable value ?

Ex:

If I store date in a variable in linux,

YESTERDAY=`date --date='1 day ago' '+%d-%m-%Y'`

it will store value to YESTERDAY as 27-1-2010.

Here I want to create file as name of 27-1-2010,

How can I create file with variable 'YESTERDAY' ?

i want appending operation too. How can i do this ?

From serverfault Kumar P

• touch $YESTERDAY
  

  or

  echo "something" > $YESTERDAY
  

  to append:

  echo "something" >> $YESTERDAY
  

  From Dennis Williamson

• I don't see anything wrong with echo "foo" >> $YESTERDAY or cat otherfile >> $YESTERDAY

  What are you trying to cat? Or alternately what are you trying to put into the file called 27-1-2010?

  From jrod

• You can use the variable $YESTERDAY in commands. Like touch $YESTERDAY, mv original_file $YESTERDAY

  From Rory McCann

• YESTERDAY=date --date='1 day ago' '+%d-%m-%Y'

  cat >> $YESTERDAY

  It too working well with appending operation

  From Kumar P