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Generic shell function to display dates from existing system date (given current date)  (for hpux, solaris and linux)

Posted on 2014-01-19
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Last Modified: 2014-01-19
I need a ascript that can help to find the last day of the previous month by given a current date in all above server OS.

For example, if cuurent date = '20/Mar/2013'
result of  "last_date = X_function" will be 28/Feb or 29/Feb depending on the year

For example, if cuurent date = '22/Mar/2013'
result of  "last_date = X_function" will be 28/Feb or 29/Feb depending on the year

if current date = '23/Jan/2014'
result of  "last_date = X_function" will be 31/Dec/2014

if current date = '03/Jan/2014'
result of  "last_date = X_function" will be 31/Dec/2014

perl calling is allowed, but has to be generic so that the perl calling can work in all above server OS.
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Question by:tindavid
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Expert Comment

by:lanboyo
ID: 39793263
Linux is easier than most because date is a lot better.

The key is always the unix époq

NOW=$( date +%s )
DOM=$( date +%d )
   # to figure out what the unix époq was the last day of last month, we would subtract the day of the month * number of seconds in a day from the current époq
LESS=$((  $DOM * 60 * 60 *24 ))
ELDOM=$(( $NOW - $LESS ))
OUTPUT= $( echo $ELDOM  | date -p +%d/%b/%Y )
echo $OUTPUT


Solaris is kind of icky, to get the current époq you have to do backflips. I will copy what I did for a different script if no one hits it first.
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Expert Comment

by:lanboyo
ID: 39793273
Seriously I have greped out the output of the date command thru the adb debugger to get the époq. Honestly, what a pain, the system is clearly using it internally, but the date command won't expose it for me in Solaris.
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Expert Comment

by:wilcoxon
ID: 39793306
What do you mean by the below?
perl calling is allowed, but has to be generic so that the perl calling can work in all above server OS.
Is it allowable to use perl modules not in the core?  What version of perl do you have installed on the machines?
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Author Comment

by:tindavid
ID: 39793352
We have Oracle software (9i - 11g)  installed in most of the servers, therefore a perl version that comes with Oracle software will do.
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Accepted Solution

by:
ozo earned 2000 total points
ID: 39793444
perl -le '($h,$d)=(localtime)[2,3]; print join"/",(split/ /,localtime time-($d*24+$h-12)*60*60)[2,1,4];'
will work across daylight saving time switchover
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