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Top Forums Shell Programming and Scripting Listing IPs from the dhcpd.conf Post 303007002 by RudiC on Thursday 9th of November 2017 02:06:41 PM
Old 11-09-2017
Try
Code:
awk -F"[ ;]*" '
/^subnet/       {SUBNET = $2
                }
/^ *fixed/      {FXIP[$3]
                }
END             {sub (/[^.]*$/, "", SUBNET)
                 for (i=1; i<255; i++)   {TMP = sprintf ("%s%d", SUBNET, i) 
                                         printf "%c%s\n", (TMP in FXIP)?"#":"", TMP
                                        }
                }
' dhcpd.conf
192.168.0.1
192.168.0.2
192.168.0.3
192.168.0.4
192.168.0.5
#192.168.0.6
#192.168.0.7
#192.168.0.8
#192.168.0.9
#192.168.0.10
192.168.0.11
192.168.0.12
192.168.0.13
192.168.0.14
192.168.0.15
.
.
.

Next time please post your own efforts and evtl. errors / failures / shortcomings.
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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