Regex question Post: 303023991

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regex question

hi, i got a problem with understanding regular expressions. what i wanna do is scanning the wtmp logfile for ips and if a specific ip is echoed id like to be a part of a text to be assigned to it. the scanning is done with #! /bin/bash cat wtmp | strings | egrep -o "+\.+\.+\." | sort -u...

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I have a simple file test.out that contains data in the form of key1=A|shift1 key2=B|shift2 key3=C|shift3 and so on. I need to get it to print A B C I can do it using lookbehind assertion such as this ( ?<==)() yet I was wondering if there is another way of mutching single...

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Hi I have a question on regex There is a line in a script like my_file="$(echo SunMonTueWed | sed "s//_&g") " My question what does the expression _&g do. Obviously in this example the output is _Sun_Mon_Tue_Wed Another question can i use some trick to get the result like...

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Hi, im sure this is really simple but i cant quite figure it out. how do i test against a word at the beginning of the line but up to the point of a delimiter i.e. ":" for example if i wanted to test against the user in the /etc/passwd file peter:x:101:100:peters account:/var/peter:/bin/sh ...

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Question on regex with * and .

I have a basic question regarding * and . while using regex: # echo 3 | grep ^*$ 3 I think I understood why it outputs "3" here (because '*' matches zero or more of the previous character) but I don't understand the output of the following command: # echo 3 | grep ^.$ # I thought I...

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I have dates in mm/dd/yy format that I wish to convert to yy-mm-dd format. ()/()/() finds them, but when I try to replace with $3-$1-$2 both kate and kwrite treat it as a text literal.

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Hi, I am trying to write a regex for myscript and need some input from experts. here is what I must grep for TICKET{Sapce}{Space}{hyphen} so here is the example data TICKET 34554, CT-12345, TICKET 12345: some text here TICKET 2342, CT-12345, MA-12344: some text here TICKET...

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Hi guys, I have a file in the following format: cmpr5551 cmpr6002 cmpr93 anne 5454 bbro 434 cmprsvc cmprsvc7 ffgi55 vefe99 cmprsvc8 cmprsvc9 I need to "grep" only the entries which start with "cmpr" followed by the number. All other entries should be excluded. I was trying to use...

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Hi guys, I am trying to "grep" or "egrep" the following entry out of the file using regex: MACCDB1 or MACCDB2 The problem is that the file might contain other entries which start with "MACCDB" string. I was trying to use regex to "grep" the exact pattern but it fails to output the correct...

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Hi I am trying to match lines having following string BIND dn="uid= putting something like this is not working : /\sBIND dn="uid=/ Any suggestion. Thanks. John

LEARN ABOUT OSX

ppmtopgm

ppmtopgm(1)						      General Commands Manual						       ppmtopgm(1)

NAME

       ppmtopgm - convert a portable pixmap into a portable graymap

SYNOPSIS

       ppmtopgm [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as  input.  Produces a portable graymap as output.  The output is a "black and white" rendering of the original
       image, as in a black and white photograph.  The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any  ppm  program  can
       read  pgm  (and	pbm  ) files automatically.  pgmtoppm is for colorizing a pgm file.  Also, see ppmtorgb3 for a different way of converting
       color to gray.  And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate  the  original
       colors, not necessarily a way that looks like a black and white photograph.

QUOTE

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

SEE ALSO

       pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

								   10 April 2000						       ppmtopgm(1)

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ppmtopgm