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Full Discussion: Grep words with X doubles only
Top Forums UNIX for Dummies Questions & Answers Grep words with X doubles only Post 302825479 by elixir_sinari on Monday 24th of June 2013 12:58:25 PM
Old 06-24-2013
/\(.\)\1/!d :
For all lines not matching the pattern, delete the pattern space. The ! is for the pattern and not for the action d. This means that for all lines not having at least 1 consecutive double character, the rest of the script will not be attempted to be executed and the next line from the input stream will be loaded in the pattern space.

s//&/4:
For all lines having at least 1 consecutive double character pair (filtered by the previous subcommand), try to substitute the 4th occurrence of the last matched pattern (that will be the pair of doubles matched by the first pattern, that is the meaning of //, not "nothing") with the matched string itself. Remember it's the 4th occurrence of the pattern and not the matched string.

t:
That's a programming command. It says that if the last substitution was successful (since the last line read), go to the end of the script (since no label is given). This ensures that if your line has 4 or more pairs of doubles, it will not be printed (helped by the -n option).

p:
And, if the line manages to cross that last barrier, just print it. This way you are assured that the line has from 1 to 3 double pairs.

Oh, seems like a long time since I used sed in my scripts.

------

@alister: Good one.
Last edited by elixir_sinari; 06-24-2013 at 02:12 PM..
These 2 Users Gave Thanks to elixir_sinari For This Post:
alister sudon't
 

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LEARN ABOUT OPENSOLARIS

gnome-dictionary

gnome-dictionary(1)						   User Commands					       gnome-dictionary(1)

NAME

       gnome-dictionary - look up words in an online dictionary

SYNOPSIS

       gnome-dictionary  [--database=database] [--list-sources] [--look-up=word] [--match=word] [--no-window] [--source=source] [--strategy=strat-
       egy] [gnome-std-options]

DESCRIPTION

       The Dictionary application enables you to look up an online dictionary for the definitions and correct spelling of words.

OPTIONS

       The following options are supported:

       -D, --database=database	       Specify the database to use.

       -l, --list-sources	       Show available dictionary sources.

       --look-up=word		       Specify the word to look up.

       --match=word		       Specify the word to match.

       -n, --no-window		       Print definitions found on the console without launching the GUI.

       -s, --source=source	       Uses the specified source for looking up words.	This does not affect the global settings.

       -S, --strategy=strategy	       Specify the strategy to use.

       gnome-std-options	       Standard options available for use with most GNOME applications.  See gnome-std-options(5) for more  infor-
				       mation.

OPERANDS

       None.

EXAMPLES

       Example 1: Launching Dictionary

       example% gnome-dictionary

EXIT STATUS

       The following exit values are returned:

       0	Application exited successfully

       >0	Application exited with failure

FILES

       The following files are used by this application:

       /usr/bin/gnome-dictionary       Executable for Dictionary.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWgnome-dictionary	   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Volatile			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       Dictionary Manual

       Latest version of the GNOME Desktop User Guide for your platform.

       attributes(5), gnome-std-options(5)

NOTES

       Written by Glynn Foster, updated by Brian Cameron, Sun Microsystems Inc., 2007.

SunOS 5.11							    09 Nov 2007 					       gnome-dictionary(1)
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