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Top Forums Shell Programming and Scripting Assign zero to strings that don't appear in block, store result in AWK array Post 302567282 by agama on Sunday 23rd of October 2011 07:59:38 PM
Old 10-23-2011
Having a predefined list is key to knowing what is missing, and yes, that is why you're getting odd output.

Using a technique similar to ahamed101's suggestion might help. Since you're not processing the contents of A and D until the end, you could save everything using doubly indexed agroup and dgroup arrays while building your list. The problem with this, and why I didn't suggest it, is that if there is a group X that is missing from all blocks of the input file, it will not be accounted for in the output.

I'll think about it some more.

---------- Post updated at 19:59 ---------- Previous update was at 19:35 ----------

Ok, this collects the various group names as it reads through the file and builds the A and D arrays at the end. If a group name is missing completely it will not be accounted for:

Code:
awk  '
    NR != FNR {
        # some other processing for file2
        next;
    }

    # ----------- blocks for processing file 1 ------------------------
    /^<x / {
        str = gensub(/(.+")([0-9]+)(">)(.+)(<\/.+)/, "\\2|\\4", "g")
        split( str, a, "|" );

        if( !seen[a[2]]++ )              # new group name, add it to the list
            list[++nlist] = a[2];

        agroup[group+0,a[2]] = a[1];   # changed to track across whole file

        # your original code
        B[gensub(/pattern/,"how","g")]      #Storing desired data in array B
        C[gensub(/pattern/,"how","g")]      # #Storing desired data in array C

        # small change to match D with A
        dgroup[group+0,a[2]] = gensub(/pattern/, "\\2|\\4", "g") # changed to track across whole file

        next;
    }

    /^<\/group>/ {
        group++;
        next;
    }

    END {
        asort( list );
        for( g = 0; g < group; g++ )            # build A and D with groups seen
        {
            for( i = 1; i <= nlist; i++ )       
            {
                A[++aidx] = sprintf( "%d|%s", agroup[g,list[i]], list[i] );
                D[aidx] = dgroup[g,list[i]];
            }
        }

        # whatever end processing on A and D can be done here
        for( i = 1; i <= length( A ); i++ )         # my testing to ensure they align
            printf( "(%s) (%s)\n", A[i], D[i] );
    }
' file1 file2

 

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VGREDUCE(8)                                                   System Manager's Manual                                                  VGREDUCE(8)

NAME
vgreduce - reduce a volume group SYNOPSIS
vgreduce [-a|--all] [-A|--autobackup y|n] [-d|--debug] [-h|-?|--help] [--removemissing] [-t|--test] [-v|--verbose] VolumeGroupName [Physi- calVolumePath...] DESCRIPTION
vgreduce allows you to remove one or more unused physical volumes from a volume group. OPTIONS
See lvm for common options. -a, --all Removes all empty physical volumes if none are given on command line. --removemissing Removes all missing physical volumes from the volume group, if there are no logical volumes allocated on those. This resumes normal operation of the volume group (new logical volumes may again be created, changed and so on). If this is not possible (there are logical volumes referencing the missing physical volumes) and you cannot or do not want to remove them manually, you can run this option with --force to have vgreduce remove any partial LVs. Any logical volumes and dependent snapshots that were partly on the missing disks get removed completely. This includes those parts that lie on disks that are still present. If your logical volumes spanned several disks including the ones that are lost, you might want to try to salvage data first by acti- vating your logical volumes with --partial as described in lvm (8). SEE ALSO
lvm(8), vgextend(8) Sistina Software UK LVM TOOLS 2.02.95(2) (2012-03-06) VGREDUCE(8)
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