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Shell Programming and Scripting

Month Substitution

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# 1  
Old 06-01-2010
Month Substitution
Team,

How do i fetch details of the last day of the month i.e 31st,30th

because we receive daily status report but not for the last days of the month..

because when i do an
Code:
echo `date +%Y%m `${yesterday}

it retrieves me 20100631 where as it should have been 20100531..

Hmm interesting!

PS:Please dont treat this as an assignment

Warm regards
Whizkidash
Last edited by Yogesh Sawant; 06-01-2010 at 10:00 AM.. Reason: added code tags
# 2  
Old 06-01-2010
have you seen this ?
# 3  
Old 06-01-2010
No...

But i have found solution for the same

If i do this..
Code:
echo `TZ=TZ+24 date +%Y%m%d`

It works

Thanks mate!

Cheers
Whizkidash
Last edited by Yogesh Sawant; 06-07-2010 at 02:20 AM.. Reason: added code tags
# 4  
Old 06-01-2010
I think your code works only for a few hours of the day.
# 5  
Old 06-01-2010
I agree. Manipulating the TZ variable in this manner can only work properly 24/7 in the GMT timezone.

The original command posted does not work because ${yesterday} is not set and evaluates to blank. The command as posted just executes:
Code:
date +%Y%m

If only we knew which Operating System and Shell the O/P has?

Iin general it is usually better to use a 00:01 cron to create a reference file "today" and age the file daily to create "yesterday" and "day-before-yesterday" files. Each file can contain the date in the format required by the reporting process or the reporting process could use the timestamp of the relevant file.
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