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Under GNU General Public License
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cronolog(1m) cronolog(1m)
NAME
cronolog - write log messages to log files named according to a template
SYNOPSIS
cronolog [OPTION]... template
DESCRIPTION
cronolog is a simple program that reads log messages from its input and writes them
to a set of output files, the names of which are constructed using template and the
current date and time. The template uses the same format specifiers as the Unix
date(1) command (which are the same as the standard C strftime library function).
Before writing a message cronolog checks the time to see whether the current log
file is still valid and if not it closes the current file, expands the template
using the current date and time to generate a new file name, opens the new file
(creating missing directories on the path of the new log file as needed unless the
program is compiled with -DDONT_CREATE_SUBDIRS) and calculates the time at which
the new file will become invalid.
cronolog is intended to be used in conjunction with a Web server, such as Apache to
split the access log into daily or monthly logs. For example the Apache configura-
tion directives:
TransferLog "|/usr/sbin/cronolog /www/logs/%Y/%m/%d/access.log"
ErrorLog "|/usr/sbin/cronolog /www/logs/%Y/%m/%d/errors.log"
would instruct Apache to pipe its access and error log messages into separate
copies of cronolog, which would create new log files each day in a directory hier-
archy structured by date, i.e. on 31 December 1996 messages would be written to
/www/logs/1996/12/31/access.log
/www/logs/1996/12/31/errors.log
after midnight the files
/www/logs/1997/01/01/access.log
/www/logs/1997/01/01/errors.log
would be used, with the directories 1997, 1997/01 and 1997/01/01 being created if
they did not already exist. (Note that prior to version 1.2 Apache did not allow a
program to be specified as the argument of the ErrorLog directive.)
Options
accepts the following options and arguments:
-H NAME
--hardlink=NAME
maintain a hard link from NAME to the current log file.
-S NAME
--symlink=NAME
-l NAME
--link=NAME
maintain a symbolic link from NAME to the current log file.
-P NAME
--prevlink=NAME
maintain a symbolic link from NAME to the previous log file. Requires that
the --symlink option is specified, as cronolog renames the current link to
the name specified for the previous link.
-h
--help print a help message and then exit.
-p PERIOD
--period=PERIOD
specifies the period explicitly as an optional digit string followed by one
of units: seconds, minutes, hours, days, weeks or months. The count cannot
be greater than the number of units in the next larger unit, i.e. you cannot
specify "120 minutes", and for seconds, minutes and hours the count must be
a factor of the next higher unit, i.e you can specify 1, 2, 3, 4, 5, 6, 10,
15, 20 or 30 minutes but not say 7 minutes.
-d PERIOD
--delay=PERIOD
specifies the delay from the start of the period before the log file is
rolled over. For example specifying (explicitly or implicitly) a period of
15 minutes and a delay of 5 minutes results in the log files being rotated
at five past, twenty past, twentyfive to and ten to each hour. The delay
cannot be longer than the period.
-o
--once-only
create single output log from template, which is not rotated.
-x FILE
--debug=FILE
write debug messages to FILE or to the standard error stream if FILE is "-".
(See the README file for more details.)
-s TIME
--start-time=TIME
pretend that the starting time is TIME (for debugging purposes). TIME
should be something like DD MONTH YYYY HH:MM:SS (the day and month are
reversed if the american option is specified). If the seconds are omitted
then they are taken as zero and if the hours and minutes are omitted then
the time of day is taken as 00:00:00 (i.e. midnight). The day, month and
year can be separated by spaces, hyphens (-) or solidi (/).
-a
--american
Interprete the date part of the starting time the American way (month then
day).
-e
--european
Interprete the date part of the starting time the European way (day then
month). This is the default.
-v
--version
print version information and exit.
Template format
Each character in the template represents a character in the expanded filename,
except for date and time format specifiers, which are replaced by their expansion.
Format specifiers consist of a '%' followed by one of the following characters:
% a literal % character
n a new-line character
t a horizontal tab character
Time fields:
H hour (00..23)
I hour (01..12)
p the locale's AM or PM indicator
M minute (00..59)
S second (00..61, which allows for leap seconds)
X the locale's time representation (e.g.: "15:12:47")
Z time zone (e.g. GMT), or nothing if the time zone cannot be determined
Date fields:
a the locale's abbreviated weekday name (e.g.: Sun..Sat)
A the locale's full weekday name (e.g.: Sunday .. Saturday)
b the locale's abbreviated month name (e.g.: Jan .. Dec)
B the locale's full month name, (e.g.: January .. December)
c the locale's date and time (e.g.: "Sun Dec 15 14:12:47 GMT 1996")
d day of month (01 .. 31)
j day of year (001 .. 366)
m month (01 .. 12)
U week of the year with Sunday as first day of week (00..53, where week 1 is
the week containing the first Sunday of the year)
W week of the year with Monday as first day of week (00..53, where week 1 is
the week containing the first Monday of the year)
w day of week (0 .. 6, where 0 corresponds to Sunday)
x locale's date representation (e.g. today in April in Britain: "13/04/97")
y year without the century (00 .. 99)
Y year with the century (1970 .. 2038)
Other specifiers may be available depending on the C library's implementation of
the strftime function.
SEE ALSO
apache(1m) date(1) strftime(3) environ(5)
More information and the latest version of cronolog can be obtained from
http://www.ford-mason.co.uk/resources/cronolog/
If you have any suggestions, bug reports, fixes, or enhancements, please mail them
to the author.
More about Apache
Documentation for the Apache http server is available from
http://www.apache.org
FUTURE DIRECTIONS
The functionality of cronolog could be built into Apache, thus saving the overhead
of having a process per log stream and that of transferring data from the server
process to the cronolog process. The main complication is handling the case where
multiple log streams are written to the same file (template), for example where
different virtual servers write to the same set of log files.
AUTHOR
Andrew Ford <A.Ford AT ford-mason.uk>
cronolog is based on a program called rotatelogs by Ben Laurie, which is packaged
with the Apache web server.
The symbolic link option was suggested by Juergen Lesny.
March 1998 cronolog(1m)
Generated by $Id: phpMan.php,v 4.54 2007/08/21 09:05:22 chedong Exp $ Author: Che Dong
On Apache/2.2.3 (CentOS)
Under GNU General Public License
2012-05-19 11:08 @172.29.30.74 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)