Bash Display First Friday of the next month


 
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Operating Systems Linux Bash Display First Friday of the next month
# 8  
Old 02-26-2018
Bash/Gnu Date version
Code:
offsets=(5 4 3 2 1 0 6)
year=2018
for month in {01..12}
do
   date +"%m/%d/%Y" --date "$year/$month/01 + ${offsets[$(date +%w --date ${year}/${month}/01)]} days"
done
01/05/2018
02/02/2018
03/02/2018
04/06/2018
05/04/2018
06/01/2018
07/06/2018
08/03/2018
09/07/2018
10/05/2018
11/02/2018
12/07/2018

Of course, the disadvantage of my solution is that you are running date twice.
Or:
Code:
starts=(6 5 4 3 2 1 7)
year=2018
for month in {01..12}
do
    dstart=$(date +%w --date "$year/$month/01")
    printf "%02d/%02d/%d\n" ${month#0} ${starts[$dstart]} $year
done

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

NAME
cal -- displays a calendar SYNOPSIS
cal [-smjy13] [[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. (This is the default.) -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. 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. If no parameters are specified, the current month's calendar is displayed. A year starts on Jan 1. 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. BSD
June 6, 1993 BSD