Add _%H_%M_%S
into the date-format string as well. For example, date +%b_%d_%Y_%H_%M_%S
produces a string likeOct_07_2012_17_57_36
. For a shorter string, consider format %s; eg, date +%s
produces a string like 1349654346, the number of seconds since 1970-01-01 00:00:00 UTC.