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Full Discussion: Grep for ip address only from a file
Top Forums UNIX for Dummies Questions & Answers Grep for ip address only from a file Post 302963715 by bakunin on Tuesday 5th of January 2016 06:45:49 AM
Old 01-05-2016
First: tools like grep will not help you because they filter certain lines (in which a certain regexp is found) only without modifying them. If you want only the IP addresses alone with no other text surrounding you need to some text-modifying tool like sed (or awk, perl, ...).

Having said this: you first need to clarify what an "IP-Address" (per your definition) is. For instance: an unsigned integer 1-256, followed by a triplett of unsigned integers 0-256, preceeded by a dot:

Code:
[1-256]  .[0-256]  .[0-256]  .[0-256]

Now, this definition would cover an "IP-Address" like "1.0.0.0", which would not be a valid address of a host (it would be the network address of the 1/8 net).

On the other hand, changing the definition to cover this, like:

Code:
[1-256]  .[0-256]  .[0-256]  .[1-256]

would invalidate an address like 10.1.1.0, which would be a valid address in the network 10.1/16.

So, the question is: which level of "rule-adherence" would you like to build into your regexp?

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
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LEARN ABOUT OPENSOLARIS

mlib_imagecolorycc2rgb

mlib_ImageColorYCC2RGB(3MLIB)				    mediaLib Library Functions				     mlib_ImageColorYCC2RGB(3MLIB)

NAME

       mlib_ImageColorYCC2RGB - YCC to RGB color conversion

SYNOPSIS

       cc [ flag... ] file... -lmlib [ library... ]
       #include <mlib.h>

       mlib_status mlib_ImageColorYCC2RGB(mlib_image *dst, const mlib_image *src);

DESCRIPTION

       The mlib_ImageColorYCC2RGB() function performs a color space conversion from ITU-R Rec.601 Y'CbCr to computer R'G'B'.

       The source and destination images must be three-channel images.

       It uses the following equation:

	 |R'|	|cmat[0] cmat[1] cmat[2]|   |Y'|   |offset[0]|
	 |G'| = |cmat[3] cmat[4] cmat[5]| * |Cb| + |offset[1]|
	 |B'|	|cmat[6] cmat[7] cmat[8]|   |Cr|   |offset[2]|

       where

	 cmat[] = { 298.082/256,    0.000/256,	408.583/256,
		    298.082/256, -100.291/256, -208.120/256,
		    298.082/256,  516.411/256,	  0.000/256 };
	 offset[] = { -222.922, 135.575, -276.836 };
	 src[x][y] = { Y', Cb, Cr };
	 dst[x][y] = { R', G', B' };

PARAMETERS

       The function takes the following arguments:

       dst    Pointer to destination image.

       src    Pointer to source image.

RETURN VALUES

       The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_ImageColorConvert2(3MLIB),	  mlib_ImageColorConvert2_Fp(3MLIB),	mlib_ImageColorRGB2XYZ(3MLIB),	 mlib_ImageColorRGB2XYZ_Fp(3MLIB),
       mlib_ImageColorRGB2YCC(3MLIB), mlib_ImageColorRGB2YCC_Fp(3MLIB), mlib_ImageColorYCC2RGB_Fp(3MLIB), attributes(5)

SunOS 5.11							    2 Mar 2007					     mlib_ImageColorYCC2RGB(3MLIB)
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