Check if today is the first weekday og the month

[Larshg]

Hi

I need a peece of code that will tell me if today is the first weekday of the month.

I have to run a job the first weekday of the month. And for that I need something that tells me, if today is the first weekday or not.

Regards
Larshg

 

[JasonDeckard]

Assuming you have a C compiler on your UNIX box, you can compile this and call it from a shell script:

#include <time.h>

/*
 * Returns 1 if this is the first weekday of the month.
 */

int main( void )
{
  struct tm tms;
  time_t t = time(NULL);

  localtime_r( &t, &tms );

  switch ( tms.tm_mday )
  {
  case 1:

    if ( tms.tm_wday > 0 && tms.tm_wday < 6 )
      return 1;

  case 2:
  case 3:

    if ( tms.tm_wday == 1 )
      return 1;
  }

  return 0;
}

If you copy the code into a file named "som.c" (for Start Of Month), you can compile the code with:

cc -o som som.c

 

[olded]

Larshg:

you can easily determine the first saturday of a month with the cal command. Given that:
$1=month
$2=day
$3=4-digit year
the last argument of this command is the date of the first
saturday of the month:
cal $1 $3|tail +3|head -1

#!/bin/ksh

dday=$2
set - $(cal $1 $3|tail +3|head -1)
echo $# # what day is the first saturday

# what's the first work day Mon .. Fri, fwday,
# when the first saturday is ..
case $# in # the first work
7) fwday=2;; # it's a monday
2|3|4|5|6) fwday=1;; # starts the 1st
1) fwday=3;; # the next mon
*) fwday=0;; #error
esac

if [[ $dday -eq $fwday ]]
then
echo "This is the first work day"
fi
# end script

I haven't tested this as thoroughly as I might have, but it looks good to me.

Regards,

Ed

 

[jad]

#!/bin/sh
DAYNUM=`date +%e`
WEEKDAY=`date +%u`

if [ $DAYNUM -lt 8 -a $WEEKDAY -eq 1 ] ; then
echo "This is the first weekday of this month"
fi

 

[Ygor]

#!/bin/sh

#---define function to see if today is the 1st working day of the month
function check_1st {
DoM=`date +'%d'`
DoW=`date +'%u'`
case $DoM in
01) case $DoW in
[1-5]) return 0 ;;
*) return 1 ;;
esac ;;
02|03) case $DoW in
1) return 0 ;;
*) return 1 ;;
esac ;;
*) return 1 ;;
esac
}

#---use it like this....
if check_1st
then
echo Today is the 1st working day of the month
else
echo Today is NOT the 1st working day of the month
fi

 

[jad]

hmm ... you're right, just looking for the first monday ...

#!/bin/sh
DAYNUM=`date +%e`
WEEKDAY=`date +%u`

if [ $DAYNUM -eq 1 -a $WEEKDAY -le 5 -o $DAYNUM -le 3 -a $WEEKDAY -eq 1 ] ; then
echo "This is the first weekday of this month"
fi

hmm ...

 

[sushveer]

Hi Larshg

Here we go!

#!/bin/ksh
WEEKDAY=`date +%w`
MONTHDAY=`date +%d`
if [[ $MONTHDAY -le 7 ]] then
if [[ $WEEKDAY = 0 ]] || [[ $WEEKDAY = 6 ]] then
echo "this is not first weekday(working day)"
else
echo "this is first weekday(working day)...You can run the job or script!"
/path_of_script_dir/file_name.ksh
fi
else
echo "This is not the first week of month"
exit 99
fi
#


sushveer
IBM certified specialist-p-series AIX5L System Administration
AIX/SOLARIS/WEBSPHERE-MQ/TIVOLI Administrator

 

[jad]

actually you only need to check the first 3 days, like my example above ... because a weekend is only 2 days long.

so either the 1st day of the month is a weekday, or the second or the third are monday.

all 7 scenarios:

M T W <-- 1st day is weekday
T W T <-- 1st day is weekday
W T F <-- 1st day is weekday
T F S <-- 1st day is weekday
F S S <-- 1st day is weekday
S S M <-- 3rd day is monday
S M T <-- 2nd day is monday

 

[sushveer]

Hi Jad

I am not considering that monday is the first working day of a month....First day of first week of month is suitable for backup as per Larshg.so I programmed in such a way that
first day may be any monday-friday..(excluding sat and sundays)

I hope this makes sense rather than prefering only monday for backup...Let Larsh decide...

sushveer
IBM certified specialist-p-series AIX5L System Administration
AIX/SOLARIS/WEBSPHERE-MQ/TIVOLI Administrator

 

[jad]

1st day of 1st week ...

if the 1st is in a weekend then the next possible working day will be a monday.

if the 1st isn't a weekend then it is the first day, and then you don't have to worry because if you're only checking 3 days the other 2 CAN NOT be monday.

seems easiest to me.