Append Date & time to File name in Window Batch file

Sometimes it may be required to schedule the same task twice a days . In such cases, we have to create two batch file and scheduling them separately because the generated name may overwrites or throws errors . To overcome from this issue , we can schedule the same task with single batch file. Suppose we have to take the logical backup of a schema(say scott) twice a days . We can do this by simply appending the date and time to the dump file name .

As in case of Linux /Unix systems, shell scripting is very liberal with variables and we can define according to ourself . e.g;
expdate=`date ‘+%d%m%Y’`
dat=`date ‘+%m%d%y %H:%M:%S’`

And then go onto define in our script as

./expdp system/xxxx  dumpfile=scott_$expdate.dmp logfile=scott_log_$expdate.log schemas=scott

But on windows machine ,we use the Date and Time function. The Date and Time function are as below  :

Date:  %date:~4,2%-%date:~7,2%-%date:~12,2%
Time:  %time:~0,2%-%time:~3,2%-%time:~6,2%  

This above function can be use to generate the unique dumpfile name. Below is the Demo of this function .

c:\> exp system/ramtech@noida  owner=scott  file=c:\scott_%date:~4,2%-%date:~7,2%-%date:~12,2%-%time:~0,2%-%time:~3,2%-%time:~6,2%.dmp log=c:\scottlog_%date:~4,2%-%date:~7,2%-%date:~12,2%-%time:~3,2%-%time:~6,2%.log    

The file name generated  i.e, dump file name is 'scott_12-22-11-12-04-31.dmp'  and log file name is 'scottlog_12-22-11-04-31.log'    where date is 12-22-11(12th-dec-2011) and time is 12-04-31(12hr:4min:31sec) .

Enjoy    J J J