UNIX for Dummies Questions & Answers

#! /bin/bash

pCheckDOW ()
{
typeset chDOW="${1:0:3}"

if [ "${chDOW}" != "Sun" ] ; then
     return 1
fi

return 0
}



pCheckAttempts ()
{
typeset fLog="${1}"
typeset iCurrDay="${2}"
typeset iNrOfAttempts=0
typeset iMaxAttempts=3
                                                     # clear log from old entries
grep "$iCurrDay" "$fLog" > "${fLog}.tmp"
mv "${fLog}.tmp" "${fLog}"
echo "$iCurrDay" >> "$fLog"

iNrOfAttempts=$(wc -l "$fLog")
if [ $iNrOfAttempts -gt $iMaxAttempts] ; then
     echo "Error: $iNrOfAttempts exceeds set maximum of $iMaxAttempts"
     return 1
fi
return 0
}





# ------- main
typeset chDate="$(date +'%a %d')"
typeset fAttemptsLog="/tmp/attempts.log"

if ! pCheckDOW "${chDate:0:3}" ; then
     echo "Error: This is the wrong day of week to run ${0}." >&2
     exit 1
fi

if ! pCheckAttempts "$fAttemptsLog" "${chDate:4:2}" ; then
     echo "Error: Attempts to run are already exhausted."
     exit 2
fi

# .... do lots of stuff here

exit 0

if [ "${DATE:0:3}" == "Sun" ]
then
	echo "Do lots of tasks here!"
	exit 0
else

if [ "${DATE:0:3}" == "Sun" ]
then
	echo "Do lots of tasks here!"
else

if [ "${DATE:0:3}" == "Sun" ]
then
	echo "Do lots of tasks here!"
else
	echo "It is not Sunday, so nothing to do!"
	exit 1
fi
n=$[ ( $n + 1 ) ]
printf "$n" > /tmp/number
if [ $n -gt 3 ]
then
	echo "Counter reset to 1 and email sent..."
	# Do your email send here...
	exit 2
fi
	n=1
	printf "$n" > /tmp/number

exit 0