How can I rename a file to match the current (rounded) time. If it is for example 10:55 or 11:05 then I would like to rename it to 11
.
Something like this:
mv file.txt file_`date +%H`.txt
but with the rounding as described above.
Thanks




You're trying to round the time to the nearest 3600 seconds. Generally, to round something, add half a unit, then truncate to that unit; this is easy to do using integer division (divide by the unit and discard the remainder, then multiply by the unit  this will always truncate, i.e. round down, but remember that you already added half a unit).



On Mac OS X (BSD date):
On Linux (GNU date):
Both do the same thing: Print the hour value of the current time + 30 minutes. 

