Sort a one-per-line list of email address, weeding out duplicates

sed 's/[ \t]*$//' < emails.txt | tr 'A-Z' 'a-z' | sort | uniq > emails_sorted.txt

9
By: jdunn
2009-02-20 19:49:17

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    1
    google contacts list name,name,email|perl -pne 's%^((?!N\/A)(.+?)),((?!N\/A)(.+?)),([a-z0-9\._-]+\@([a-z0-9][a-z0-9-]*[a-z0-9]\.)+([a-z]+\.)?([a-z]+))%${1}:${3} <${5}>%imx' #see below for full command
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  • The vi key sequence "!}" will feed the block of lines from the current position to the next blank line to the command provided: in this case "sort -nut. -k 1,1 -k 2,2 -k 3,3 -k 4,4". The sort is ascending, numeric (-n), removing duplicates (-u), using "." as key delimiter (-t ."). The "-nut." is a memorable mnemonic :-). The same command (less the "!}") can, of course, be used from command line to sort a file of IP addresses in a text file. In the command line version, I found it also useful to remove blank lines and comment lines thusly: < IPaddresses.txt sed -e "/^#/d" -e "/^$/d" | sort -nut. -k 1,1 -k 2,2 -k 3,3 -k 4,4 # sort IP addresses


    0
    !}sort -nut. -k 1,1 -k 2,2 -k 3,3 -k 4,4
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  • List all MAC addresses on a Linux box. sort -u is useful when having virtual interfaces.


    2
    sort -u < /sys/class/net/*/address
    marssi · 2011-05-18 17:50:44 0

What Others Think

Doing a bit of normalisation there too.
hendry · 438 weeks and 6 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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