Look for IPv4 address in files.

alias ip4grep "grep -E '([0-9]{1,3}\.){3}[0-9]{1,3}'"
It finds a SNMP OID too :-(
Sample Output 
% ip4grep /var/www/conf/httpd.conf
#Listen 192.0.2.3:80
# You will have to access it by its address (e.g., http://192.0.2.34/)
# e.g., www.apache.org (on) or 204.62.129.132 (off).
#NameVirtualHost 192.0.2.3:80
#NameVirtualHost 192.0.2.3

% ip4grep `find /etc -name '*.conf' -type f -print`
/etc/mrouted.conf:#name LOCAL 239.255.0.0/16
/etc/resolv.conf:nameserver 127.0.0.1
/etc/snmp/snmpd.conf:# % snmpwalk -v 1 -c public localhost .1.3.6.1.4.1.2021.2
...

5
By: azumakuniyuki
2009-02-09 15:08:16
alias
3
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What Others Think

If you want to be sure that it is a valid IPv4 address, you can use this grep instead: grep -P '\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b'
DEinspanjer · 886 weeks and 6 days ago
Thank you DEinspanjer. I tried it, but there is no '-P' option in my OpenBSD's grep and MacOS X Tiger's grep.
azumakuniyuki · 886 weeks and 6 days ago
Sorry, OpenBSD's grep has '-P' option, but it is not Perl regular expression.
azumakuniyuki · 886 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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