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Top Forums UNIX for Dummies Questions & Answers How to get the previous month by using `date` Post 302283133 by suneelj on Monday 2nd of February 2009 04:24:45 PM
Old 02-02-2009
Java How to get the previous month by using `date`

Hello,
I'm new to shell scripting.
We've develop a script which will grep a file on the search criteria, MON (Jan/Feb/Mar/etc). But we should set this sript in cron which will run on every first day of the month. The problem I'm having is, when I run the script, it is displaying the contents of the present month. But I need the contents of the last month.
If the present month is Feb, the output that I should get is of Jan.
I'm using below in the script.
********************************************
set -x
#!/bin/sh
MON=`date +%b` #Feb
grep \/$MON\/ File1.txt > Output1.txt #This file should have the contents of Jan, not of Feb.
********************************************

Can anyone please help me to achieve the expecting output.

Thanks
~Suneel

Last edited by suneelj; 02-02-2009 at 05:39 PM..
 

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JDMONTHNAME(3)								 1							    JDMONTHNAME(3)

jdmonthname - Returns a month name

SYNOPSIS
string jdmonthname (int $julianday, int $mode) DESCRIPTION
Returns a string containing a month name. $mode tells this function which calendar to convert the Julian Day Count to, and what type of month names are to be returned. Calendar modes +-----+--------------------------------------+---+ |Mode | | | | | | | | | Meaning | | | | | | | | Values | | | | | | +-----+--------------------------------------+---+ | 0 | | | | | | | | | Gregorian - abbreviated | | | | | | | | Jan, Feb, Mar, Apr, May, Jun, Jul, | | | | Aug, Sep, Oct, Nov, Dec | | | | | | | 1 | | | | | | | | | Gregorian | | | | | | | | January, February, March, April, | | | | May, June, July, August, September, | | | | October, November, December | | | | | | | 2 | | | | | | | | | Julian - abbreviated | | | | | | | | Jan, Feb, Mar, Apr, May, Jun, Jul, | | | | Aug, Sep, Oct, Nov, Dec | | | | | | | 3 | | | | | | | | | Julian | | | | | | | | January, February, March, April, | | | | May, June, July, August, September, | | | | October, November, December | | | | | | | 4 | | | | | | | | | Jewish | | | | | | | | Tishri, Heshvan, Kislev, Tevet, She- | | | | vat, AdarI, AdarII, Nisan, Iyyar, | | | | Sivan, Tammuz, Av, Elul | | | | | | | 5 | | | | | | | | | French Republican | | | | | | | | Vendemiaire, Brumaire, Frimaire, | | | | Nivose, Pluviose, Ventose, Germinal, | | | | Floreal, Prairial, Messidor, Thermi- | | | | dor, Fructidor, Extra | | | | | | +-----+--------------------------------------+---+ PARAMETERS
o $jday - The Julian Day to operate on o $calendar - The calendar to take the month name from RETURN VALUES
The month name for the given Julian Day and $calendar. PHP Documentation Group JDMONTHNAME(3)
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