Homework & Coursework Questions

I am very new to Linux/Unix. Kindly assist the following:

I wish to write a bash shell script called how_many_to_go that calculates and prints the number of days, hours, minutes and/or seconds until the end of the current month (based on the output of the date command).



Kenyatta University Kenya. Lecturer: Dr. Waweru Michael. Course Code. BBIT 202.

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Hi alobi,
Here is the script -

num=$#
option=$1
typeset -R2 lastday=$(cal)
currdate=`date "+%d"`
days_to_go=`expr $lastday - $currdate`
hrs_gone=`date "+%H"`
mins_gone=`date "+%M"`
secs_gone=`date "+%S"`
secs_gone=`expr $secs_gone + $mins_gone \* 60`
secs_gone=`expr $secs_gone + $hrs_gone \* 60 \* 60`
secs_to_go=`expr $days_to_go \* 24 \* 60 \* 60`
secs_to_go=`expr $secs_to_go - $secs_gone`
if [ $num -gt 0 ]
then
if [ $option == "-s" ]
then
echo "Time left is 0 : 0 : 0 : $secs_to_go"
elif [ $option == "-m" ]
then
secs=`expr $secs_to_go % 60`
mins=`expr $secs_to_go / 60`
echo "Time left is 0 : 0 : $mins : $secs"
elif [ $option == "-h" ]
then
secs=`expr $secs_to_go % 60`
mins=`expr $secs_to_go / 60`
hrs=`expr $mins / 60`
mins=`expr $mins % 60`
echo "Time left is 0 : $hrs : $mins : $secs"
fi
else
secs=`expr $secs_to_go % 60`
mins=`expr $secs_to_go / 60`
hrs=`expr $mins / 60`
mins=`expr $mins % 60`
days=`expr $hrs / 24`
hrs=`expr $hrs % 24`
echo "Time left is $days : $hrs : $mins : $secs"
fi