Shell Programming and Scripting

I am fairly new to unix scripting, the problem is i can understand the unix script. but i fail to write. I do not know where to start and how to end.
I am sure this forum will help to achive my dream scriptings in unix. Thanks in adv for your help.

Here I need.. I have list of columns in one text file
data would look like
cust_dn
order_bkp
invoice

i have files in different folder. where i need to search the data in file in these folder.

Please help me how to write from the begning.

I did not get all you wanted, but is this what you search?

Code:

~/unix.com$ grep -r 'what_you_search' /path/to/your/directory

this command will search for 'what_you_search' in the directory of your choice.
-r tells grep to search recursively in the directory

You probably need to loop through the strings first:

Code:

while read mStr; do
  egrep -r "${mStr}" File
done < Strings_File