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Grep URL
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| cat urls.html | grep -Eo "(http|https)://[a-zA-Z0-9./?=_-]*" | sort -u | |
| grep -E : is the same as egrep | |
| grep -o : only outputs what has been grepped | |
| (http|https) : is an either / or | |
| a-z : is all lower case | |
| A-Z : is all uper case | |
| . : is dot | |
| / : is the slash | |
| ? : is ? | |
| *: is repeat the [...] group | |
| sort -u : will sort & remove any duplicates |
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