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- unique-slug
- ===========
- Generate a unique character string suitible for use in files and URLs.
- ```
- var uniqueSlug = require('unique-slug')
- var randomSlug = uniqueSlug()
- var fileSlug = uniqueSlug('/etc/passwd')
- ```
- ### uniqueSlug(*str*) → String (8 chars)
- If *str* is passed in then the return value will be its murmur hash in
- hex.
- If *str* is not passed in, it will be 4 randomly generated bytes
- converted into 8 hexadecimal characters.
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