touch "foo.backup.$(date +%F_%R)" | date +'%j' #day of year
touch "foo.backup.$(date +%F_%R)"
$ ll foo*
-rw-rw-r-- 1 saml saml 0 Oct 16 19:25 foo.backup.2013-10-16_19:25
Additional formats
If you want to take full control if you consult the man page you can do things like this:$ date +"%Y%m%d"
20131016
$ date +"%Y-%m-%d"
2013-10-16
$ date +"%Y%m%d_%H%M%S"
20131016_193655
ubu1404@ubuntu1404lb01:~$ date +'%j'
063 #day
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