shell program

write a shell program(boune shell) on the following topic.

watching all people logging in and out and report as people come and go- a sort of incremental who. also display statistics of people logged in and logged out every 2 minutes.
sriram_bandiAsked:
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etdeyConnect With a Mentor Commented:
#!/bin/sh
#
# watch_logins.sh
#

last | grep -v "still logged in" > /tmp/last.off.log0
last | grep    "still logged in" > /tmp/last.on.log0

echo "First cycle is empty..."

while [ 1 ]; do

  last | grep -v "still logged in" > /tmp/last.off.log1
  last | grep    "still logged in" > /tmp/last.on.log1

  echo "-----------------------------"
  date
  echo "-----------------------------"

  echo "Logins:"
  echo "-------"
  diff /tmp/last.on.log0  /tmp/last.on.log1 | egrep '^> '

  echo ""

  echo "Logoffs:"
  echo "--------"
  diff /tmp/last.off.log0  /tmp/last.off.log1 | egrep '^> '

  echo ""

  mv /tmp/last.off.log1 /tmp/last.off.log0
  mv /tmp/last.on.log1 /tmp/last.on.log0

  sleep 120

done
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festiveCommented:
well you could do the following:
tail -f /var/log/syslog

this will give you a complete running log and some other usefull info.

alternatively:

#!/bin/sh -p
while true; do
    who
    sleep 120
done >> /usr/local/logs/userlog.log
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sriram_bandiAuthor Commented:
it's not a incremental who
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tfewsterCommented:
This guy seems a bit smarter than the last person who asked for the answers on this homework assignment a couple of months ago:
- He's split the paper into 2 questions, rather than ask them all together
- He's not asked the "Test if a string is a palindrome" question, so I guess he's worked it out himself ;-)

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festiveCommented:
agreed, interesting comment , first he says that he wants "a sort of incremental who", then he rejects two ways of achieving it, admittedly the who was cheap and nasty, But so is someone cheating on their homework. :-)
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tfewsterCommented:
I see the palindrome question HAS been posted now :-)

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