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unix scripting

Unix / Linux Shell: Parse Text CVS File Separator By Field

I work for a small ISP (Internet Service Provider) and we are using Linux and Unix-like operating system with bash shell. I want to write a shell script to parse the csv file line by line. Then line must be parse again field by field. The sample input file is as follows:


I need to extract each of these example.com,username,groupname,homedir,md5password,permission,secondarygroup fields and passed to the different system utilities. How do I write a shell script to automate this task and use the bash shell to parse a text file?
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How To Write First UNIX Korn Shell Script Program

Can you tell me how to write a UNIX korn shell script program? I'm new to UNIX scripting and HP-UX UNIX operating system.
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Bash Append Text To a Variable

How do I append additional text a variable? For e.g., I've a vech set as follows:
I'd like to add (append) "Bus" word to $vevh under UNIX scripting using bash?
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