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:

example.com,username,groupname,homedir,md5password,permission,secondarygroup

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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HowTo: Move A Folder In Linux Using mv Command

How do I move a folder in BSD/Linux/Apple OX or Unix operating system using bash command line option?
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Linux / UNIX: TZ Environment Variable

What is the correct format for a TZ (time zone) environment variable for use with the Linux or UNIX operating system?
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HowTo: Check Swap Usage In IBM Aix Unix

How do I check swap space usage (paging) under IBM AIX Unix operating system using command line options?
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Linux: rsync Copy Directories Structures Tree Only

I am looking for to only sync directories structures only. How do I copy directory structure tree without copying any files under Linux or UNIX operating system to remove server or local directory?
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Linux / UNIX: Kill User Session

How do I kill all users session under Linux or UNIX operating system using command prompt?
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Find: UNIX Operating System Release and Version Number

How do I find Unix version and release number using command line options? What version, release, and maintenance level of Unix is running on my system?
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unix operating system