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Top Forums UNIX for Dummies Questions & Answers How to find second and fourth Monday of the month? Post 302948416 by RudiC on Monday 29th of June 2015 02:40:52 PM
Old 06-29-2015
With GNU date and a recent bash, try this:
Code:
for MONTH in {01..12}
    do printf "%2s.%2s.%4s      %2s.%2s.%4s\n" \
                $(($(date -d"2015${MONTH}01" +"16 - %u - (%u==1?7:0)"))) $MONTH 2015 \
                $(($(date -d"2015${MONTH}01" +"30 - %u - (%u==1?7:0)"))) $MONTH 2015
    done
12.01.2015    26.01.2015
 9.02.2015    23.02.2015
 9.03.2015    23.03.2015
13.04.2015    27.04.2015
11.05.2015    25.05.2015
 8.06.2015    22.06.2015
13.07.2015    27.07.2015
10.08.2015    24.08.2015
14.09.2015    28.09.2015
12.10.2015    26.10.2015
 9.11.2015    23.11.2015
14.12.2015    28.12.2015

Feel free to adapt to other years.
 

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CAL(1)							    BSD General Commands Manual 						    CAL(1)

NAME
cal -- displays a calendar SYNOPSIS
cal [-smjy13] [[[day] month] year] DESCRIPTION
Cal displays a simple calendar. If arguments are not specified, the current month is displayed. The options are as follows: -1 Display single month output. (This is the default.) -3 Display prev/current/next month output. -s Display Sunday as the first day of the week. -m Display Monday as the first day of the week. -j Display Julian dates (days one-based, numbered from January 1). -y Display a calendar for the current year. -V Display version information and exit. A single parameter specifies the year (1 - 9999) to be displayed; note the year must be fully specified: ``cal 89'' will not display a calen- dar for 1989. Two parameters denote the month (1 - 12) and year. Three parameters denote the day (1-31), month and year, and the day will be highlighted if the calendar is displayed on a terminal. If no parameters are specified, the current month's calendar is displayed. A year starts on Jan 1. The first day of the week is determined by the locale. The Gregorian Reformation is assumed to have occurred in 1752 on the 3rd of September. By this time, most countries had recognized the ref- ormation (although a few did not recognize it until the early 1900's.) Ten days following that date were eliminated by the reformation, so the calendar for that month is a bit unusual. HISTORY
A cal command appeared in Version 6 AT&T UNIX. OTHER VERSIONS
Several much more elaborate versions of this program exist, with support for colors, holidays, birthdays, reminders and appointments, etc. For example, try the cal from http://home.sprynet.com/~cbagwell/projects.html or GNU gcal. AVAILABILITY
The cal command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/. BSD
June 6, 1993 BSD
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