Answer to Homework 2 of 6 October 1997

   Call a program from your .profile file. Below are several solutions.

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   First a simple one. Write the following shell script:

#!/bin/ksh
typeset account="`logname`@`uname -n`"
typeset destined=wimr
echo "Login at time " `date` " into account " $account | \
   elm -s $account $destined

Put this shell script in a file, say called fff. Make sure that it is
executable. Call the file from .profile. Redefine the destined parameter to
send email to another account.

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   Second example. I essentially copied this one from Brian Cain. Write the
shell script

hour=`date +%H`
if test $hour -gt 12
  then 
    DAY_NIGHT='am'
  else
    DAY_NIGHT='pm'
fi
CURR_TIME=`date +%-I:%M$DAY_NIGHT`
CURR_DATE=`date +%D`

if test $hour -gt 22
then
  mail cainjr << __EOF__
Someone logged in at $CURR_TIME, on $CURR_DATE.
__EOF__
else
   if test $hour -lt 8
  then mail cainjr << __EOF__
Someone logged in at $CURR_TIME on $CURR_DATE.
__EOF__
   fi
fi

Put this shell script in a file, say called fff. Make sure that it is
executable. Call the file from .profile. Rename from cainjr to send email to
another account.

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   Third example. I essentially copied this one from Royce Dsouza. Write the
shell script

#!/bin/ksh
typeset hour=`date +%H`
typeset time=`date +%T`
typeset date=`date +%D`
typeset user=`whoami`
 
if (( hour<=7 ))
then echo "$user logged in on $date at $time." | mail rdsouza
elif ((hour>=23 ))
then echo "$user logged in on $date at $time." | mail rdsouza
fi

Put this shell script in a file, say called fff. Make sure that it is
executable. Call the file from .profile. Rename from rdsouza to send email to
another account.

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   Fourth example. I essentially copied this one from Tanya Ershova. Write the
shell script

hour=`date | cut -c12-13`
if [ $hour -le 7 -o $hour -ge 23 ]
   then
      echo You logged in on ` date` | mail ershova
fi

Put this shell script in a file, say called fff. Make sure that it is
executable. Call the file from .profile. Rename from ershova to send email to
another account.

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   Fifth example. I essentially copied this one from Reginald Tauro. Write the
shell script

date > datefile
awk '{if ($4 >= 23 || $4 <= 7 ) mail rtauro < intruder}' datefile

Put this shell script in a file, say called fff. Make sure that it is
executable. Call the file from .profile. Rename from rtauro to send email to
another account.

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Wim Ruitenburg