#!/bin/bash# cal2day - "parse" appropriate calendar output to match date number#	    with day name.## usage: cal2day month day [year]## ORIGINAL *TAG:33239 3:Dec 9 1997:0755:sh.d/cal2day:## Obtained from usenet## Converted to bash v2 syntax by Chet Ramey <chet@po.cwru.edu>#1 PARSE OPTIONSwhile getopts :dls _instdo	case $_inst in	(d)	format='%1d%.0s\n' ;;		# 0, 1, ..., 7	(l)	format='%0.s%-s\n' ;;		# Sunday, Monday, ..., Saturday	(s)	format='%0.s%-.3s\n' ;;		# Sun, Mon, ..., Sat	esacdoneshift $((OPTIND-1))#2 PARAMETER VALUES((!$#)) && set -- $(date '+%m %d'): ${format:='%0.s%-.3s\n'}: ${1:?missing month parameter [1-12]}: ${2:?missing day parameter [1-31]}#3 CALCULATE DAY-OF-WEEK FROM DATEcal $1 ${3:-$(date +%Y)} | gawk -FX 'BEGIN	{ day="Sunday   Monday   Tuesday  WednesdayThursday Friday   Saturday"	  sub(/^0/, "", daynum)	  dayre="(^| )" daynum "( |$)"	}#NR==2	{ print length($0) }NR==1 || NR==2 \	{ next }dayre	{ if (match($0, dayre))	  {	#print RSTART, RLENGTH, substr($0, RSTART, RLENGTH)		if (daynum<=9 || RSTART==1) RSTART-=1		exit	  }	}END	{ # 20/21 char width assumed	  printf format, RSTART/3, substr(day, RSTART*3+1, 9)	}' daynum=$2 format=$format -exit 0