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Need help in writing the shell script

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Top Forums Shell Programming and Scripting Need help in writing the shell script
# 8  
Old 10-02-2008
The main question is, do you run it in a cron job every five minutes and if so how do you check whether the action should be to start or not, and when to send a report (and how)? If you run it in a loop the state (auditing or not) is easier to handle, but it might be less robust.

Code:
auditing=false
while true; do
  loggedin=$(who | grep '^gayathri ')
  if $auditing then
    case $loggedin in '') audit stop; auditing=false; send report;; esac
  else
    case $loggedin in '') ;; *) audit start; auditing=true;; esac
  fi
  sleep 300
done

But what if this script is terminated because the load gets too high or something? Then you don't know what the state is when you restart it.

Sorry for the awk faux pas; the correct way to code that would be something like

Code:
who | awk 'BEGIN { rc=1; } $1 == "gayathri" { rc=0; } END { exit rc }'

... but I guess the grep version is really better.
Last edited by era; 10-02-2008 at 08:17 AM.. Reason: Corrected awk script
# 9  
Old 10-02-2008
Quote:
Originally Posted by era
The main question is, do you run it in a cron job every five minutes and if so how do you check whether the action should be to start or not, and when to send a report (and how)? If you run it in a loop the state (auditing or not) is easier to handle, but it might be less robust.

But what if this script is terminated because the load gets too high or something? Then you don't know what the state is when you restart it.
Yep. That was my question as well.

Quote:

Sorry for the awk faux pas; the correct way to code that would be something like

Code:
who | awk 'BEGIN { rc=1; } $1 == "gayathri" { rc=0; } END { exit rc }'

... but I guess the grep version is really better.
Maybe, but Awk looks awksome offcourse. But I think both these problems might be an overkill for the problem gayathri is trying to solve; it's probably better to kick off the audit monitor and exclude those he doesn't want to monitor there.
# 10  
Old 10-02-2008
Era, thanks...when I tried to execute, I get the error:
0403-057 Syntax error at line 8 : `else' is not expected

However, I do not find anything wrong with the syntax. Any idea what it could mean??

Gayathri
# 11  
Old 10-02-2008
Well
Code:
auditing=false
while true; do
  loggedin=$(who | grep '^gayathri ')
  if $auditing
  then
    case $loggedin in '') audit stop; auditing=false; send report;; esac
  else
    case $loggedin in '') ;; *) audit start; auditing=true;; esac
  fi
  sleep 300
done

It worked well now!
# 12  
Old 10-02-2008
Code:
  if $auditing then

Or in the same line modification should be as

Code:
  if $auditing; then

# 13  
Old 10-02-2008
Clearly not my day today. Sorry for the error again.
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