02-02-2009
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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LEARN ABOUT PHP
jdmonthname
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)