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Full Discussion: Grep for the same occurrence or maybe Sed
Top Forums Shell Programming and Scripting Grep for the same occurrence or maybe Sed Post 28046 by Optimus_P on Wednesday 11th of September 2002 06:42:18 PM
Old 09-11-2002
Quote:
Originally posted by photon
grep will not do it, because you need to store values.

Try Perl.

This code should print output such as.

Line: 344 Content: dasdjasdjoasjdoasjdoa SYN dakspodkapsdka
Line: 345 Content:asdasdasdasdasdasdasd SYN sdfsdfsdfsdfdf
Line: 346 Content:asdasdasdasdasdasdasd SYN sdfsdfsdfsdfdf
Dude, you have 3 lines!

just a couple of comments on the code if you dont mind.

1) dont use html. (unless you want to display it on a web page. in that case i would opt to make it a cgi and be able to run it on demand via the web.
2) the code as is does not work. your missing a double quote and a semicolon.
3) you will only get lines 1,2,3 not 4,5,6 and so on down the file. just an FYI. remember your resetting $count almost everytime.
4) instead of $count == 3 its prolly better to do a catch and and say ($count => 3) you never know if there can be more then 3.
5) remove the first print. so only the >=3 SYN lines print.

other wise pretty cool man. niCe job.

*Perderabo is my ksh hero
 

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LEARN ABOUT OPENSOLARIS

synos

synos(1)                                                        Mail Avenger 0.8.3                                                        synos(1)

NAME

       synos - guess operating system from TCP SYN fingerprint

SYNOPSIS

       synos [--mtu mtu] [--db path] syn-fingerprint

DESCRIPTION

       synos takes a SYN fingerprint, in the format described for the CLIENT_SYNFP environment variable in the avenger(1) man page, and outputs a
       guess as to the type of the client operating system.  synos makes use of the OpenBSD SYN fingerprint database (which is also repackaged
       with Mail Avenger).

   OPTIONS
       --mtu val
           Certain operating systems set the initial TCP window size based on the maximum transmission unit, or MTU, of the network.  For such
           operating systems, synos usually checks the window size using both the client's MSS option plus 40 bytes (for TCP and IP headers), or a
           hard-coded MTU, which defaults to 1,500 bytes.  If either value works, the fingerprint is considered to match the operating system.
           You can change the value 1,500 by specifying this option.  A value of 0 tells synos to use only the value derived from the MSS option.

       --db file
           Specifies an alternate location for the SYN fingerprint database.

FILES

       /usr/local/share/pf.os
           Default location of SYN fingerprint database.

SEE ALSO

       avenger(1), asmtpd(8)

       The Mail Avenger home page: <http://www.mailavenger.org/>.

       The OpenBSD home page: <http://www.openbsd.org/>.

BUGS

       The operating system type is determined by heuristics that are not always reliable.  Moreover, not all operating systems can be
       distinguished.  The database may not even contain a client's particular operating system and version.

       It is not hard to fool synos deliberately by changing TCP socket options or injecting raw packets onto the network.

AUTHOR

       David Mazieres

Mail Avenger 0.8.3                                                  2012-04-05                                                            synos(1)
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