ArticleHow to get all emails from the text with one command?

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I got an interesting problem today: there is a big text, in this text there many emails, need to get unique emails from this text, sort them and put in the file. It turned out that it is possible to do with one command. Here it is. 

 grep -E -o "\b[a-zA-Z0-9.-]+@[a-zA-Z0-9.-]+\.[a-zA-Z0-9.-]+\b" file.txt | sort -n | uniq > emails.txt
 
The grep command gets all the emails from the text, then then they are sorted, left only unique and written to the file.
 
If all your data is located not in one file and you need to join all the file to one then there is another command:
 
cat file1 filefile3 > file4
 
Love Linux :)
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