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group id

Bash Shell: Check File Exists or Not

How do I test existence of a text file in bash running under Unix like operating systems?
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Linux: Show The Groups a User Is In

How do I find out what groups I belong to under Linux operating systems?
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Can you completely explain the nine permissions bits on UNIX or Linux files?
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Q. User tom is a member of a group called sales and printer. I'd like to remove tom from a group called printer without editing any user configuration text files stored at /etc/ directory?
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Understanding /etc/group File

Can you explain me the format of /etc/group user group file under Linux / UNIX operating systems?
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Understanding /etc/passwd File Format

Can you explain /etc/passwd file format for Linux and UNIX operating systems?
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