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Full Discussion: Find Day of Week
Operating Systems HP-UX Find Day of Week Post 302731563 by alister on Thursday 15th of November 2012 10:32:52 AM
Old 11-15-2012
Quote:
Originally Posted by rwuerth
Code:
set -A _WKDY Saturday Sunday Monday Tuesday Wednesday Thursday Friday
 
print ${_WKDY[$(cal $mth $yr | awk -vDD=$day 'FNR==3 {print ((7-$NF)+DD)%7}')]}

I'm basically just wondering if anyone can break this given a modern date and valid inputs. (no using February 30th! :-) ) I can't break it, but I've a nagging suspicion I'm missing something. Smilie
I don't see anything wrong with your code (given the stipulations in place).

If you like, you can just print the day of the week directly from AWK.
Code:
cal $mth $yr | awk 'NR==3 {split("Sat Sun Mon Tue Wed Thu Fri", wk); print wk[(7-NF+DD)%7+1]}' DD=$day

The additional +1 shift is needed because split()'s result begins at offset 1 in the array.

Some cals print unambiguous column headers, such as "Su Mo Tu We Th Fr Sa". When that's the case, and if they are sufficient, then one can use them directly instead of splitting a hardcoded list:
Code:
cal $mth $yr | awk 'NR==2 {split($0, wk)} NR==3 {print wk[(7-NF+DD-1)%7+1]}' DD=$day

Regards,
Alister
This User Gave Thanks to alister For This Post:
 

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CAL(1)								   User Commands							    CAL(1)

NAME
cal - display a calendar SYNOPSIS
cal [options] [[[day] month] year] DESCRIPTION
cal displays a simple calendar. If no arguments are specified, the current month is displayed. OPTIONS
-1, --one Display single month output. (This is the default.) -3, --three Display prev/current/next month output. -s, --sunday Display Sunday as the first day of the week. -m, --monday Display Monday as the first day of the week. -j, --julian Display Julian dates (days one-based, numbered from January 1). -y, --year Display a calendar for the current year. -V, --version Display version information and exit. -h, --help Display help screen and exit. PARAMETERS
A single parameter specifies the year (1 - 9999) to be displayed; note the year must be fully specified: cal 89 will not display a calendar 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. AVAILABILITY
The cal command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux June 2011 CAL(1)
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