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Full Discussion: Bash cript to calculate summarize address
Top Forums Shell Programming and Scripting Bash cript to calculate summarize address Post 302965696 by RudiC on Tuesday 2nd of February 2016 07:05:46 AM
Old 02-02-2016
I came up with this - not thoroughly tested, and not necessarily most efficient, and possibly won't run with sh, but seems to work (with e.g. recent bash):
Code:
MAX=0
OLDIP=0
while read LINE
  do    IP=$((0x$(printf "%02X" ${LINE//./ })));
        if [ "$OLDIP" -gt 0 ]
          then  TMP=$((IP ^ OLDIP ))
                if [ "$TMP" -gt "$MAX" ]
                  then MAX=$TMP
                  fi
          fi
        OLDIP=$IP
  done < $1

for ((EXP=1; EXP<=32 && 2**EXP<=MAX; EXP++)); do :; done
NET=$((IP & (2**EXP - 1 ^ 2**32 - 1) ))
printf "SuperNet: %d.%d.%d.%d/%d\n" $((NET>>24)) $((NET>>16&255)) $((NET>>8&255)) $((NET&255)) $((32-EXP));

Put into a script file, make it executable, put your IPs into another file, and run script like
Code:
./script filr
SuperNet: 192.168.1.0/24

Last edited by RudiC; 02-02-2016 at 08:13 AM..
 

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LEARN ABOUT DEBIAN

rig

RIG(6)								   Games Manual 							    RIG(6)

NAME

       RIG - Random Identity Generator

USAGE

       rig [ -f | -m ] [ -d datadir ] [ -c num ]

DESCRIPTION

       Rig is a utility that will piece together a random first name, last name, street number and address, along with a geographically consistant
       (ie, they all match the same area) city, state, ZIP code, and area code.

       It is suitable for such applications as feeding the NY times registration page to fend off junk (snail) mail and telemarketers, or for reg-
       istering on BBS's to which you don't wish to reveal your real information.

OPTIONS

       -f, -m Respectively, use female and male names. If neither or both options are selected, RIG uses both female and male names.

       -d datadir
	      Use data files found in datadir. Without this option, the default directory of /usr/share/rig is assumed.

       -c num Output num identities. Default is 1.

FILES

       /usr/share/rig/locdata.idx
       /usr/share/rig/street.idx
       /usr/share/rig/fnames.idx
       /usr/share/rig/mnames.idx
       /usr/share/rig/lnames.idx

HISTORY

       Based on "fake" written for MS-DOS. Unfortunately the author and publish date are unknown.

       First UNIX version written from scratch in 1999.

       This manpage based on RIG version 1.10.

AUTHORS

       UNIX  version  (c)  1999-2002 Ian Turner with contributions from Ian Prowell, Nick Rusnov, and Schneelocke.  Geography Database is from the
       original  version  and  I  believe  it  to  be  held   in   the	 public   domain.    Names   database	is   from   the   US   Census	at
       http://www.census.gov/genealogy/names/ , courtesy of Trent Stanley.

       Send all comments and bug-reports to:

       vectro@RIG.sourceforge.net

								    4 JUN 2002								    RIG(6)
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