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A comment on What is your favorite command-line trick using Bash?.
dog http://ifconfig.me | egrep -wo '[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}' | uniq
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dog http://ifconfig.me | egrep -wo '[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}' | uniq