Shell Programming and Scripting

Hi All,

Here is my script

Code:

#! /bin/sh
var1=some email id
var2=some email id
grep -i "FAILED FILE FORMAT VALIDATION" /opt >tmp2
diff tmp1 tmp2 | grep ">" >tmp3
if [ $? -eq 0 ]
then
   cat tmp3 | mailx -s " Error Monitoring" $var2
else
   echo "Pattern NOt Found" | mailx -s " Error Monitoring" $var1
fi
cat tmp2 >>tmp1
rm tmp3
rm tmp2

When executing this script for one time i am getting the right output and for the secind time also i am getting the right output.When i ran it for the third time im not getting the right output.
Could anyone guide me in generating the right script.
Whenever i search a pattern,and if the pattern was found then var2 must execute and when not found var1 must execute.If the same pattern found again it doesn't mail me that pattern.It must mail me pattern not found.

There are several problems here...

Is this a homework assignment? If it is, please fill out the complete homework template and refile your request in the Homework & Coursework Questions forum.

If not, what type of file is /opt? (The grep utility isn't intended to work on directories.) If it is a regular file, what is in it?

What does the program email do on your system when given the operand id? How does the value of the variables var1 and var2 in the environment affect its behavior?

What is in the file tmp1 when you run your script each of the first three times?

What is the "right output" for each of the 1st three times when you run this script?

What operating system are you using?

What diagnostics did your script produce each of the 1st three times you ran it?