Shell Programming and Scripting

#!/bin/ksh
IAm=${0##*/}
if [ $# -eq 0 ]
then	printf 'Usage: %s YYYY-MM-DD...\n' "$IAm" >&2
	exit 1
fi
# Process each operand given...
while [ $# -gt 0 ]
do	# Grab year from start of the operand.
	year=${1%%-*}
	# Throw away the day from the end of the operand.
	month=${1%-*}
	# Throw away the year (leaving the month) from the operand.
	month=${month#*-}
	# Read the desired variable values from the following awk script...
	read var120 var28 <<-EOF
		$(cal $month $year | awk '
			NR > 2 && NF {
				# We have skipped over the leading header lines
				# and any empty lines, so what we have left are
				# the days in a given week.  If we have seven
				# days in this week, we have 2 weekend days and
				# 5 weekdays, otherwise we have one weekend day
				# and NF - 1 weekdays.
				weekenddays += 1 + (NF == 7)
				weekdays += NF - 1 - (NF == 7)
			}
			END {	# Print the results...
				print weekdays, weekenddays
			}
		')
	EOF
	printf '%s %d week-days and %d weekend-days in %s-%s\n' \
	    'Do whatever you want with' "$var120" "$var28" "$year" "$month"
	shift
done

./tester 2016-09-10 2016-02-12 2016-08-05 2015-02-12 2016-01-31

Do whatever you want with 22 week-days and 8 weekend-days in 2016-09
Do whatever you want with 21 week-days and 8 weekend-days in 2016-02
Do whatever you want with 23 week-days and 8 weekend-days in 2016-08
Do whatever you want with 20 week-days and 8 weekend-days in 2015-02
Do whatever you want with 21 week-days and 10 weekend-days in 2016-01

cat script_cal.ksh 
MONTH=`echo $1 | cut -d- -f2`
YEAR=`echo $1 | cut -d- -f3`
VAL=`cal $MONTH $YEAR | awk 'NR>2 && NF{
                    if($0 ~ /^[[:space:]]/){
                                A[$NF]++;
                                   };
                    if(($0 !~ /^[[:space:]]/) && NF<7){
                                        B[$1]++;
                                          };
                    if(NF==7){
                            B[$1]++;
                            A[$NF]++
                         };
                    Q=$NF
                      } 
                END       {
                    print Q-length(A)-length(B)"-"length(A)+length(B);
                  }
                       '`
echo ${VAL##*-}  ##This is value of weekends in a month var28
echo ${VAL%%-*}  ##This is value of weekdays in a month var120

#!/bin/bash

GIVEN_DATE=${1}
YEAR=$(echo ${GIVEN_DATE} | cut -d- -f1)
MONTH=$(echo ${GIVEN_DATE} | cut -d- -f2)
cal ${MONTH} ${YEAR} | awk 'NR>2&&NF!=0{if(NF==7){w+=2;}else{w+=1;}E=$NF}END{print w,E-w}' | while read WEEKEND WEEKDAY
do
	echo "Week Day : ${WEEKDAY}"
	echo "Week End : ${WEEKEND}"
done

$ cal 2 2004
   February 2004
Su Mo Tu We Th Fr Sa
 1  2  3  4  5  6  7
 8  9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29

$ cal 2 04
     February 4
Su Mo Tu We Th Fr Sa
                1  2
 3  4  5  6  7  8  9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29

$

set 2016-09-10
TMP=${1#*-}; ncal ${TMP%-*} ${1%%-*} | awk 'NR>1 && NR<7 {WD+=NF-1} NR>=7 {WE+=NF-1} END {print WD, WE}'
22 8

TMP=${1#*-}; ncal ${TMP%-*} ${1%%-*} | { read; while read A; do set $A; case $1 in S?) (( WE+=$#-1));; *) (( WD+=$#-1)); esac;  done; echo $WD, $WE; }
22, 8

#!/usr/bin/env bash

# @(#) s1       Demonstrate count weekdays, weekENDs in a given month.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
em() { pe "$*" >&2 ; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C dateutils.dconv dateutils.dadd dateutils.dseq

pe
if [ $# -gt 0 ]
then
  set -- 2016-9.11
else
  set -- 2016-09-10 2016-02-12 2016-08-05 2012-2-15 2012-10-14 2012-01-22 2017-02-29 2016-02-29
fi

for YMD
do
  # YearMonthNow, YearMonthFuture.
  dateutils.dconv -f "%Y-%m" "$YMD" > /dev/null
  ES=$?
  db " Exit status of dconv is :$ES: for date $YMD"
  if [ $ES -ne 0 ]
  then
        pe
    em " Skipping input, date has bad form or is impossible: \"$YMD\""
        continue
  else
        YMN=$( dateutils.dconv -f "%Y-%m" "$YMD" )-01
  fi
  db " YMN is $YMN"
  YMF=$( dateutils.dadd -f "%Y-%m" "$YMD" +1m )-01
  db " YMF is $YMF"
  ymd=$( dateutils.dseq -i "%Y-%m-%d" -f "%F %a" $YMN $YMF | sed '$d' )
  db " ymd = $ymd"
  
  weekdays=$( echo "$ymd" |
    grep -E 'Mon|Tue|Wed|Thu|Fri' |
  wc -l)
  weekends=$( echo "$ymd" |
    grep -E 'Sat|Sun' |
  wc -l )
  
  pl " For date $YMD:"
  pe " Weekdays = $weekdays"
  pe " WeekENDS = $weekends"
done

exit 0

$ ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.4 (jessie) 
bash GNU bash 4.3.30
dateutils.dconv dconv 0.3.1
dateutils.dadd dadd 0.3.1
dateutils.dseq dseq 0.3.1


-----
 For date 2016-09-10:
 Weekdays = 22
 WeekENDS = 8

-----
 For date 2016-02-12:
 Weekdays = 21
 WeekENDS = 8

-----
 For date 2016-08-05:
 Weekdays = 23
 WeekENDS = 8

-----
 For date 2012-2-15:
 Weekdays = 21
 WeekENDS = 8

-----
 For date 2012-10-14:
 Weekdays = 23
 WeekENDS = 8

-----
 For date 2012-01-22:
 Weekdays = 22
 WeekENDS = 9

 Skipping input, date has bad form or is impossible: "2017-02-29"

-----
 For date 2016-02-29:
 Weekdays = 21
 WeekENDS = 8

#input date as 20160912
M=$1
Start=`expr  $M - $M % 100`
Start=`expr $Start + 1`
End=`expr $Start + 100`
echo $Start $End
sj=`date --date="$Start" +%j`
ej=`date --date="$End" +%j`
lj=`expr  $ej - $sj`
echo $ej $sj $lj
i=1
weekend=0
weekday=0
while [ $i -le $lj ]
do
test_day=`date --date="$Start" +%u`
if [ $? -eq 0 ]
then
  echo $Start $test_day
  if [ $test_day -gt 5 ]
  then
   weekend=`expr $weekend + 1`
  else
   weekday=`expr $weekday + 1`
  fi
fi
Start=`expr $Start + 1`
i=`expr $i + 1`
done 
echo weekdays $weekday
echo weekends $weekend