01-21-2008
find formatted filename with date time
Hi,
I operate and use HF radars along the California coast for ocean surface currents. The devices use Mac OS as the control and logging software. The software generates thousands of files a week and while I've used PERL in the past to solve the problems of finding files I come to realize some inherent inefficiencies with this type of search method. Ultimately I'd like to find files using the unix find command, however, my knowledge of regular expressions is in its infancy and I'm learning. So in my pursuit of this knowledge I'm turning to this forum to hopefully give me some hints.
The files fortunately are all fairly standardize -- i.e. the filename format is:
TYPE_SITE_[YY|YYYY]_MO_MD_[HHMM|HHMMSS].[xx|xxx]
where,
TYPE is a three or four character string depicting the type of data (CSS, CSQ, RDLi, STAT, etc.)
SITE is a four character string depicting the name of the radar site (GCYN, NPGS, BML1, etc.)
YYYY is a two or four digit year
MO is a two digit month
MD is a two digit month day
HH is a two digit hour
MM is a two digit minute
SS is a two digit second
xxx is a two or three character string for a file extension
The main difficulty I have is in crossing years -- i.e. if I wanted to say find CSS files for site BML1 between Dec 29th 2007 and Jan. 2nd 2008. Any advice / pointers on how to attack this using the find or grep or egrep commands would be greatly appreciated.
Thanks,
dpath2o
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DATE(1) General Commands Manual DATE(1)
NAME
date - print or set the date and time
SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format]
OPTIONS
-q Read the date from stdin
-s Set the time (implicit for -q or a date string)
-u Print the date as GMT
-t Use this number of seconds instead of current time
EXAMPLES
date # Print the date and time
date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m.
DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the
hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time,
with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed
by a printf-like string with the following options:
%% % character
%A Name of the day
%B Name of the month
%D mm/dd/yy
%H Decimal hour on 2 digits
%I Decimal hour modulo 12 on 2 digits
%M Decimal minute on 2 digits
%S Decimal seconds on 2 digits
%T HH:MM:SS
%U Decimal week number, Sunday being first day of week
%W Decimal week number, Monday being first day of week
%X Same as %T
%Y Decimal year on 4 digits
%Z Time Zone (if any)
%a Abbreviated name of the day
%b Abbreviated name of the month
%c Appropriate date & time (default format)
%d Decimal day of the month on 2 digits
%e Same as %d, but a space replaces leading 0
%h Same as %b
%j Decimal dey of the year on 3 digits
%m Decimal month on 2 digits
%n Newline character
%p AM or PM
%r 12-hour clock time with AM/PM
%s Number of seconds since the epoch
%t Tab character
%w Decimal day of the week (0=Sunday)
%x Same as %D
%y Decimal year on 2 digits
SEE ALSO
time(2), ctime(3), readclock(8).
DATE(1)