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Top Forums Shell Programming and Scripting How to extract log info based on last month? Post 302444974 by durden_tyler on Friday 13th of August 2010 10:33:41 AM
Old 08-13-2010
Quote:
Originally Posted by superHonda123
...
The issue is, how to extract the log data based on last month?

For example:
Let's say the month of august 2010 is already over, now I wanted to extract all log info from July.
...
If August 2010 is already over, then we are either in September 2010 or later. In that case you'll have to jump at least 2 months prior.

But your first question is about one month prior. In any case, if you have GNU date in your system, then:

Code:
date --date='1 month ago'

returns the date one month ago as compared to today's date and time.
And ditto for 2 months prior:

Code:
date --date='2 months ago'

And the format string "%b" returns just the month in 3-character code, like so -

Code:
$
$ date --date='1 month ago' '+%b'
Jul
$

It should be easy, therefore, to grep for occurrences of prior month in the output of "last -R" :

Code:
last -R | grep $(date --date='1 month ago' '+%b')

tyler_durden
 

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CAL(1)							    BSD General Commands Manual 						    CAL(1)

NAME
cal, ncal -- displays a calendar and the date of easter SYNOPSIS
cal [-jy] [[month] year] cal [-j] -m month [year] ncal [-jJpwy] [-s country_code] [[month] year] ncal [-Jeo] [year] DESCRIPTION
The cal utility displays a simple calendar in traditional format and ncal offers an alternative layout, more options and the date of easter. The new format is a little cramped but it makes a year fit on a 25x80 terminal. If arguments are not specified, the current month is dis- played. The options are as follows: -J Display Julian Calendar, if combined with the -e option, display date of easter according to the Julian Calendar. -e Display date of easter (for western churches). -j Display Julian days (days one-based, numbered from January 1). -m month Display the specified month. -o Display date of orthodox easter (Greek and Russian Orthodox Churches). -p Print the country codes and switching days from Julian to Gregorian Calendar as they are assumed by ncal. The country code as deter- mined from the local environment is marked with an asterisk. -s country_code Assume the switch from Julian to Gregorian Calendar at the date associated with the country_code. If not specified, ncal tries to guess the switch date from the local environment or falls back to September 2, 1752. This was when Great Britain and her colonies switched to the Gregorian Calendar. -w Print the number of the week below each week column. -y Display a calendar for the specified year. A single parameter specifies the year (1 - 9999) to be displayed; note the year must be fully specified: ``cal 89'' will not display a calen- dar for 1989. Two parameters denote the month and year; the month is either a number between 1 and 12, or a full or abbreviated name as specified by the current locale. Month and year default to those of the current system clock and time zone (so ``cal -m 8'' will display a calendar for the month of August in the current year). A year starts on Jan 1. SEE ALSO
calendar(3), strftime(3) HISTORY
A cal command appeared in Version 5 AT&T UNIX. The ncal command appeared in FreeBSD 2.2.6. AUTHORS
The ncal command and manual were written by Wolfgang Helbig <helbig@FreeBSD.org>. BUGS
The assignment of Julian--Gregorian switching dates to country codes is historically naive for many countries. BSD
November 23, 2004 BSD
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