crontab grep function execution

Question

When I tried exection grep function in particular directory its working on that directory but when I am trying to execute using absolute paths grep is not working for example

 grep `date +%Y-%m-%d` /var/wwww/file/file.log >> /home/filename/file.log

The above command output getting as empty file.
Is it possible to schedule grep in crontab to match text and generate valid output ?

Answer 1

The % in your crontab file gets turned into a newline character unless escaped with a backslash. Try

grep `date +\%Y-\%m-\%d` /var/wwww/file/file.log >> /home/filename/file.log

see

man 5 crontab

for details.