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Full Discussion: Remove lines that are subsets of other lines in File
Top Forums Shell Programming and Scripting Remove lines that are subsets of other lines in File Post 302941908 by Chubler_XL on Wednesday 22nd of April 2015 04:47:24 PM
Old 04-22-2015
This solution keeps the lines with most IPs first although not optimal it should give fairly more concise answers than just processing file top to bottom.

I tried it on a data files with 170K lines and it took approx 3 seconds to process.

Code:
awk '
function have(ln,ip,num) {
  ret=1
  num=split(ln,ips)
  for(ip=1;ip<=num;ip++)
     if(!(ips[ip] in havelist)) {
         havelist[ips[ip]]
         unique++
         ret=0
      }
  return ret
}
{ L[NR]=$0;D[NF]=D[NF] " " NR; max=NF>max?NF:max }
END {
   for(c=max;c;c--)
      if(D[c]) {
         lns=split(D[c],v)
         for(i=1;i<=lns;i++)
           if(!have(L[v[i]])) print L[v[i]]
      }
   printf "Data file contains %'\''d unique IPs\n", unique > "/dev/stderr"
}' infile


For anyone who wants to test possible solutions I used the script to make my test file:

Code:
for ((i=0;i<170000;i++))
do
    printf "10.0.%d.%d" $((RANDOM%256)) $((RANDOM%256))
    ips=$((RANDOM%8))
    while ((--ips > 0))
    do
       printf " 10.0.%d.%d" $((RANDOM%256)) $((RANDOM%256))
    done
    printf "\n"
done

Last edited by Chubler_XL; 04-22-2015 at 05:53 PM..
 

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LEARN ABOUT HPUX

split

split(1)						      General Commands Manual							  split(1)

NAME

       split - split a file into pieces

SYNOPSIS

       line_count] suffix_length] [file [name]]

       nsuffix_length] [file [name]]

   Obsolescent
       n] [file [name]]

DESCRIPTION

       reads  file  and  writes  it  in  pieces  (default  1000 lines) onto a set of output files.  The name of the first output file is name with
       appended, and so on lexicographically, up to (only ASCII letters are used, a maximum of 676 files).  If no output name  is  given,  is  the
       default.

       If no input file is given, or if is given instead, the standard input file is used.

   Options
       recognizes the following command-line options and arguments:

	      The input file is split into pieces
			     line_count lines in size.

	      suffix_length  letters  are  used  to  form the suffix of the output filenames.  This option allows creation of more than 676 output
			     files.  The output file names created cannot exceed the maximum file name length allowed in the directory	containing
			     the files.

	      The input file is split into pieces
			     n bytes in size.

	      The input file is split into pieces
			     n x 1024 bytes in size.  No space separates the n from the

	      The input file is split into pieces
			     n x 1048576 bytes in size.  No space separates the n from the

	      The input file is split into pieces
			     n lines in size.  This option is obsolescent and is equivalent to using the option.

EXTERNAL INFLUENCES

   Environment Variables
       determines the locale for the interpretation of text as single- and/or multi-byte characters.

       determines the language in which messages are displayed.

       If  or  is  not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty
       variable.  If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of

       If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are  set  to	"C".   See
       environ(5).

   International Code Set Support
       Single- and multi-byte character code sets are supported.

SEE ALSO

       csplit(1).

STANDARDS CONFORMANCE

																	  split(1)
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