How to write a bourne shell to do with logfiles??

Shell Programming and Scripting
1

Hi,I have a task have to do is writing an only Bourne shell to do with logfiles.
Because I am not really a programmer,just unix administrator.
So I need someone can do this for me.

The requirement is
1,be able to run in an environment that does not include a path. (i.e. the environment provided by cron)

2,accept the name of a logfile as the sole command line argument

3,search the specified logfile for lines that have been added since the previous search.

4,construct an e-mail reporting any lines that contain either "error" or "warning" in any combination of upper and lower case letters

5,send the e-mail to the address specified in the RECIPIENT shell variable which is defined within the script

2

We want to help you if you have shown that you have put some effort into solving your problem but not to do your work for you, we are not a helpdesk service.

On the other hand, this really smells like homework to me.

3

Easy enough. Just have the script fix its own path.

export PATH="/usr/local/bin:/usr/bin:/bin:/usr/sbin"

What if the logfile's been truncated since last time it ran?

Cron output should be automatically mailed without doing anything special if cron is configured correctly.