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How to properly construct regular expression for "grep" linux program, to find all email in, say /etc directory ? Currently, my script is following:
grep -srhw "[[:alnum:]]*@[[:alnum:]]*" /etc
It working OK - a see some of the emails, but when i modify it, to catch the one-or-more charactes before- and after the "@" sign ...
grep -srhw "[[:alnum:]]+@[[:alnum:]]+" /etc
.. it stops working at all
Also, it does't catches emails of form "[email protected]"
Help !
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To find a pattern that is more than one word long, enclose the string with single or double quotation marks. The grep command can search for a string in groups of files. When it finds a pattern that matches in more than one file, it prints the name of the file, followed by a colon, then the line matching the pattern.
The grep command is a useful Linux command for performing file content search. It also enables us to recursively search through a specific directory, to find all files matching a given pattern. Let's look at the simplest method we can use to grep the word “Baeldung” that's included in both .
Here is another example
grep -Eiorh '([[:alnum:]_.-]+@[[:alnum:]_.-]+?\.[[:alpha:].]{2,6})' "$@" * | sort | uniq > emails.txt
This variant works with 3 level domains.
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