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Full Discussion: Removing dupes within 2 delimited areas in a large dictionary file
Top Forums Shell Programming and Scripting Removing dupes within 2 delimited areas in a large dictionary file Post 302740215 by gimley on Wednesday 5th of December 2012 08:17:21 PM
Old 12-05-2012
Removing dupes within 2 delimited areas in a large dictionary file
Hello,
I have a very large dictionary file which is in text format and which contains a large number of sub-sections. Each sub-section starts with the following header :
Code:
#DATA
#VALID 1[this could be also be 0 instead of 1]

and ends with a footer as shown below
Code:
#END

The data between the Header and the Footer consists of words, each word on a separate line.
However given the large data, it so happens that within a section, words are repeated, as a result of which the file ends up with dupes.
What I need is a PERL or AWK script which could identify the header and the footer, find the data within them and sort the data removing all duplicates.
A sample input and output are given below. The examples are from English since the real time data is in Perso-Arabic script. Case is not an issue since the language does not have case. All data is in Unicode :UTF16 but I can convert it to Unicode 8
Could it be possible to please comment the script so that I can learn how to identify Headers and Footeers with a database and then sort them removing dupes.
Many thanks in advance for help and also the learning experience

_____Sample Input
Code:
#DATA
#VALID 1
a
a
a
a
all
an
and
and
and
are
are
are
as
awk
below
case
case
could
data
data
data
data
does
dupes
duplicates
ends
english
examples
file
find
footer
from
given
given
happens
have
header
however
i
identify
in
input
is
is
is
issue
it
language
large
need
not
not
of
or
output
perl
perso-arabic
real
removing
repeated
result
sample
script
script
section
since
since
so
sort
that
the
the
the
the
the
the
the
the
the
them
time
up
what
which
which
with
within
within
words
#END

___________Expected output
Code:
#DATA
#VALID 1
a
all
an
and
are
as
awk
below
case
could
data
does
dupes
duplicates
ends
english
examples
file
find
footer
from
given
happens
have
header
however
i
identify
in
input
is
issue
it
language
large
need
not
of
or
output
perl
perso-arabic
real
removing
repeated
result
sample
script
section
since
so
sort
that
the
them
time
up
what
which
with
within
words
#END

_____Sample ends
Last edited by Scrutinizer; 12-07-2012 at 04:03 AM.. Reason: code tags
 

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LEARN ABOUT CENTOS

cracklib-format

cracklib-format(8)					      Debian GNU/Linux manual						cracklib-format(8)

NAME

       cracklib-format, cracklib-packer, cracklib-unpacker - cracklib dictionary utilities

SYNOPSIS

       cracklib-format file ...

       cracklib-packer cracklib_dictpath

       cracklib-unpacker cracklib_dictpath

DESCRIPTION

       cracklib-format	takes a list of text files each containing a list of words, one per line, It lowercases all words, removes control charac-
       ters, and sorts the lists.  It outputs the cleaned up list to standard output.  The text files may be optionally compressed with gzip(1).

       If you supply massive amounts of text to cracklib-format you must have enough free space available for use by the sort(1) command.  If  you
       do not have 20Mb free in /var/tmp (or whatever temporary area your sort(1) command uses), have a look at the /usr/sbin/cracklib-format pro-
       gram which is a sh(1) program.  You can usually tweak the sort(1) command to use any large area of disk	you  desire,  by  use  of  the	-T
       option.	cracklib-format has a hook for this.

       cracklib-packer	reads  from  standard input a list of sorted and cleaned words and creates a database in the directory and prefix given by
       the command line argument cracklib_dictpath.  Three files are created with the suffixes of .hwm, .pwd, and .pwi.  These three files are	in
       the  format  that  the  FascistCheck(3) subroutine, cracklib-unpacker(8), and cracklib-check(8), utilities understand.  The number of words
       read and written are printed on stdout(3).

       cracklib-unpacker reads from the database in the directory and prefix given by the command line argument cracklib_dictpath and  outputs	on
       standard output the list of words that make up the database.

       The  database  is in a binary format generated by the utilities cracklib-format(8) and cracklib-packer(8).  On a Debian system the database
       is located in the directory /var/cache/cracklib/cracklib_dict and is generated daily with the program /etc/cron.daily/cracklib.	The  loca-
       tion  is  also  defined	in  the  header  file  crack.h using the constant CRACKLIB_DICTPATH though none of the subroutines in the cracklib
       libraries have this location hardcoded into their implementations.

FILES

       /var/cache/cracklib/cracklib_dict.[hwm|pwd|pwi]
	      cracklib dictionary database files used by utilities.

       /etc/cron.daily/cracklib
	      cracklib daily cron program to rebuild the cracklib dictionary database.

       /etc/cracklib/cracklib.conf
	      cracklib configuration file used by the cracklib daily cron program to rebuild the cracklib dictionary database.

       /usr/include/crack.h
	      cracklib header file defining the subroutine FascistCheck(3) and the constant CRACKLIB_DICTPATH used to compile in the  location	of
	      the cracklib dictionary database for these utilities.

       /usr/sbin/cracklib-format
	      cracklib shell script to create initial list of words for dictionary database.

SEE ALSO

       FascistCheck(3), cracklib-check(8), update-cracklib(8), create-cracklib-dict(8)
       /usr/share/doc/libcrack2/libcrack2.html
       /usr/share/doc/cracklib-runtime/cracklib-runtime.html

AUTHOR

       cracklib2 is written by Alec Muffett <alecm@crypto.dircon.co.uk>. Manual added by Jean Pierre LeJacq <jplejacq@quoininc.com>.

2.7-8.5 						   Sat Jun 21 22:43:12 CEST 2008					cracklib-format(8)
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