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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calendar(1)						      General Commands Manual						       calendar(1)

Name
       calendar - calendar reminder service

Syntax
       calendar [-]

Description
       The  command  consults the file `calendar' in the current directory and prints out lines that contain today's or tomorrow's date.  The com-
       mand recognizes most month-day dates, such as Dec. 7, december 7, 12/7, but it does not recognize dates formatted in the following ways:  7
       December  or  7/12.  If you give the month as * with a date, such as, * 1, that day in any month will do.  On weekends, specifying tomorrow
       extends through Monday.

       When an argument is present, the command searches through a user's calendar file in his login directory and sends him any positive  results
       by Normally this is done daily under control of

       The  calendar  file  is	first  run  through  the  C  preprocessor, to include any other calendar files specified with the #include syntax.
       Included calendars are shared by all users, and are maintained and documented by the local administration.

Options
       -    Functions for every user who has a calendar file in his login directory.

Restrictions
       The extended idea of tomorrow does not account for holidays.

Files
       calendar
       /usr/lib/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)

																       calendar(1)