Shell Programming and Scripting

FREQ_MIN=9  #run every 10 minutes

while true
do
DTMM=$(date "+%M")
DTHH=$(date "+%H")
echo $((($DTMM/$FREQ_MIN+1)*$FREQ_MIN - $DTMM))
sleep $(((($DTMM/$FREQ_MIN+1)*$FREQ_MIN - $DTMM)*60))
#To run at particular hrs
case $DTHH in
03|06|08|11|15|19|23) if [ $DTMM -le $FREQ_MIN ]
          then
          /production/07a/scripts/dna_monitor/dna_monitor_v1.ksh MAIL_ALWAYS
          sleep 60 #to avoid continuous looping
          continue
          fi
          ;;
esac
/production/07a/scripts/dna_monitor/dna_monitor_v1.ksh MAIL_ON_ISSUE
sleep 60 #to avoid continuous looping

done

0,10,20,30,40,50  3,6,8,11,15,19,23 * * * /production/07a/scripts/dna_monitor/dna_monitor_v1.ksh MAIL_ALWAYS

sleep $(((29-$DTMM%30)*60));

#!/bin/sh
#
#	Author: 	Simon Arjuna Erat (sea)
#	Contact:	erat.simon@gmail.com
#	License:	GNU Lesser General Public License (LGPL)
#	Created:	2014.03.22
#	Changed:	2014.03.24
	script_version=0.2
#	Description:	Trying to 'replace' a single cronjob
#
#	Variables
#
	ME="$(basename $0)"
	minute=60
	hour=$[ 60 * $minute ]
	intervall=$minute
	intervall_anyway=9
	counter=1
	exe_anyway="/production/07a/scripts/dna_monitor/dna_monitor_v1.ksh MAIL_ALWAYS"
	exe_cmd="/production/07a/scripts/dna_monitor/dna_monitor_v1.ksh MAIL_ON_ISSUE"
	job_hour=(3 6 9 11 15 19 23)		# Change for the hours of occourence
	job_minute=(0 10 20 30 40 50)		# Change for the minutes of occourence
	logfile=/var/log/dna_monitor.log
	alias currentHour="date +'%H'"
	alias currentMinute="date +'%M'"
	alias now="date +'%Y.%m.%d - %H:%M'"
#
#	Display & Action
#
	echo "Started $ME ($script_version)..."
	while true;do
		sleep $intervall
		((counter++))
		for ENTRY in ${job_hour[@]};do
			# Check if current hour has a job
			if [ $(currentHour) -eq $ENTRY ]
			then	# Check if current minute has a job
				for ENTRY in ${job_minute[@]};do
					# If job is due, print current date+time to log & execute it
					[ $(currentMinute) -eq $ENTRY ] && \
						printf "$(now) -- EXEC $exe_cmd\n" | tee $logfile && \
						$exe_cmd | tee $logfile 
				done
			fi
		done
		[ $counter -eq $intervall_anyway ] && \
			counter=1 && \
			$exe_anyway
	done

./test_sleeper.ksh: line 46: [: missing `]'