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Full Discussion: AWK - printing certain fields when field order changes in data file
Top Forums Shell Programming and Scripting AWK - printing certain fields when field order changes in data file Post 302185720 by eric4 on Tuesday 15th of April 2008 04:28:35 PM
Old 04-15-2008
I think I figured it out:

Code:
awk '
BEGIN {FS=";"} 
/;src;/{
for (num=1;num<=NF;num++) {if ($num == "src") fieldsrc=num}; 
for (num=1;num<=NF;num++) {if ($num == "dst") fielddst=num}; 
for (num=1;num<=NF;num++) {if ($num == "proto") fieldproto=num};
} 

!/;src;/{print $fieldsrc";"$fielddst";"$fieldproto}
'

seems to work for this example:

10.10.10.1;10.10.10.2;tcp
10.10.10.3;10.10.10.4;udp
10.10.10.5;10.10.10.6;tcp
10.10.10.1;10.10.10.2;tcp
10.10.10.5;10.10.10.6;tcp
10.10.10.3;10.10.10.4;udp
10.10.10.5;10.10.10.6;tcp

Now if I can figure it out for the real world data ...
 

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LEARN ABOUT BSD

disktab

DISKTAB(5)							File Formats Manual							DISKTAB(5)

NAME

       disktab - disk description file

SYNOPSIS

       #include <disktab.h>

DESCRIPTION

       Disktab	is a simple date base which describes disk geometries and disk partition characteristics.  The format is patterned after the term-
       cap(5) terminal data base.  Entries in disktab consist of a number of `:' separated fields.  The first entry for each disk gives the  names
       which are known for the disk, separated by `|' characters.  The last name given should be a long name fully identifying the disk.

       The following list indicates the normal values stored for each disk entry.

       Name  Type  Description
       ns    num   Number of sectors per track
       nt    num   Number of tracks per cylinder
       nc    num   Total number of cylinders on the disk
       b0    str   Filename of block zero primary bootstrap for device
       ba    num   Block size for partition `a' (bytes)
       bd    num   Block size for partition `d' (bytes)
       be    num   Block size for partition `e' (bytes)
       bf    num   Block size for partition `f' (bytes)
       bg    num   Block size for partition `g' (bytes)
       bh    num   Block size for partition `h' (bytes)
       fa    num   Fragment size for partition `a' (bytes)
       fd    num   Fragment size for partition `d' (bytes)
       fe    num   Fragment size for partition `e' (bytes)
       ff    num   Fragment size for partition `f' (bytes)
       fg    num   Fragment size for partition `g' (bytes)
       fh    num   Fragment size for partition `h' (bytes)
       pa    num   Size of partition `a' in sectors
       pb    num   Size of partition `b' in sectors
       pc    num   Size of partition `c' in sectors
       pd    num   Size of partition `d' in sectors
       pe    num   Size of partition `e' in sectors
       pf    num   Size of partition `f' in sectors
       pg    num   Size of partition `g' in sectors
       ph    num   Size of partition `h' in sectors
       se    num   Sector size in bytes (default 512)
       sf    bool  supports bad144-style bad sector forwarding
       so    bool  partition offsets in sectors
       ty    str   Type of disk (e.g. removable, winchester)

       Disktab entries may be automatically generated with the diskpart program.

FILES

       /etc/disktab

SEE ALSO

       newfs(8), diskpart(8), getdiskbyname(3)

BUGS

       This file shouldn't exist, the information should be stored on each disk pack.

4.2 Berkeley Distribution					   May 17, 1986 							DISKTAB(5)
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