shell - escape string and make it unix ready -

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I would like to take a string that can contain many places and do the following:

1) One Change whitespace with underscore

2) Remove characters that are not AZ or 0-9

3) Make the result all lowercase

Then a variable Any ideas able to use the result in the form?

I think you can do whatever you like.

variable = $ (echo "$ {input}" | tr az az | tr [: empty:] _ | tr -cd [: alnum:] _)

Explanation:

tr az az - translate the uppercase letters to lower.

tr [: blank:] _ - Translates the blank to underscore.

tr -cd [: alnum:] _ - Delete all characters that are not alphanumeric, or underscores.

Note: If you want to remove the underscores before converting the empty space into underscore, then the tr-cd _ can be added near the beginning of the pipe chain.


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