Question: How do I use grep to implement the following in shell script? A filename component can only contain the 26 upper case alphabets, the 26

How do I use grep to implement the following in shell script?

A filename component can only contain the 26 upper case alphabets, the 26 lower case alphabets, '.', '-' and '_' A filename component cannot start with the hyphen - Except for '.' and '..', a file name component cannot start with the dot . The length of a filename component cannot exceed 14

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