How to find second and fourth Monday of the month? Post: 302948575

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Top Forums UNIX for Dummies Questions & Answers How to find second and fourth Monday of the month? Post 302948575 by Prathmesh on Tuesday 30th of June 2015 01:24:54 PM

06-30-2015

Registered User

Quote:

Originally Posted by RudiC

That's because the algorithm assigns day 7 to the second week already, which is the case for the second Monday of September and December, 2015. On top, the empty lines are due to invalid dates for months that dont have a 31., or 29., 30., 31. for February. And, DATE and dayofmonth hold identical values. Try the modified script:

Code:

YEAR=2015
for MONTH in $(seq -w 1 12) 
  do for DATE in $(seq -w 1 31)
    do dayofweek=$(date -d"${YEAR}${MONTH}${DATE}" +%w)
       [ $? == 0 ] || continue
       weekofmonth=$(( 1 + (10#$DATE - 1) / 7 ))
       if [ $dayofweek -ne 1 -o \( $weekofmonth -ne 2 -a $weekofmonth -ne 4 \) ]
         then continue
         else MONDAY_DATE=`date -d"${YEAR}${MONTH}${DATE}" +%d.%m.%Y`
              echo "$MONDAY_DATE"
       fi
    done
  done

Thanks RudiC.
Can you please advise how are you coming up with the value 10 in below code? Basically, I want to understand the thought process while selecting the value, so the logic will be clear and will help in long run.

Code:

weekofmonth=$(( 1 + (10#$DATE - 1) / 7 ))

Prathmesh

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LEARN ABOUT BSD

calendar

CALENDAR(1)						      General Commands Manual						       CALENDAR(1)

NAME

       calendar - reminder service

SYNOPSIS

       calendar [ - ]

DESCRIPTION

       Calendar consults the file `calendar' in the current directory and prints out lines that contain today's or tomorrow's date anywhere in the
       line.  Most reasonable month-day dates such as `Dec. 7,' `december 7,' `12/7,' etc., are recognized, but not `7 December'  or  `7/12'.	If
       you give the month as ``*'' with a date, i.e. ``* 1'', that day in any month will do.  On weekends `tomorrow' extends through Monday.

       When  an argument is present, calendar does its job for every user who has a file `calendar' in his login directory and sends him any posi-
       tive results by mail(1).  Normally this is done daily in the wee hours under control of cron(8).

       The file `calendar' is first run through the ``C'' preprocessor, /lib/cpp, to include any other calendar files  specified  with	the  usual
       ``#include'' syntax.  Included calendars will usually be shared by all users, maintained and documented by the local administration.

FILES

       calendar
       /usr/libexec/calendar to figure out today's and tomorrow's dates
       /etc/passwd
       /tmp/cal*
       /lib/cpp, egrep, sed, mail as subprocesses

SEE ALSO

       at(1), cron(8), mail(1)

BUGS

       Calendar's extended idea of `tomorrow' doesn't account for holidays.

7th Edition							 October 21, 1996						       CALENDAR(1)

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