You could use a hash to get from file2, the files parameter, you want and using a while loop, check if these files parameter gotten from file2 exists in file1. if so print the whole line of file1.
Like this: 

use warnings;
use strict;
use Inline::Files;

my %hash;

while (<DATA2>) {
    next if /^\s*$/;
    $hash{ ( split /\s+?/, $_ )[2] } = undef;
}

while (<DATA1>) {
    next if /^\s*$/;
    if (/^.+?\s(.+?)\s/) {
        print $_ if exists $hash{$1};
    }
}

__DATA1__
ID alan135 /xkr $work(b05bfn00un0c3) / b05bfn00un0c3;   #<= b05bfn00un
+0d0 Size:5848.270996

ID John06 /ext $work(b05bfn00ld0p7) / b05bfn00ld0p7;    #<= b05bfn00ld
+0s0 Size:INFINITY

ID lily099 /poli $work(b05bfn00ld0p7) / b05bfn00ld0p7;    #<= b05bfn00
+ld0s0 Size:INFINITY

ID sam012 /pp $work(b05bfn00ld0p7) / b05bfn00ld0p7;      #<= b05bfn00l
+d0s0 Size:INFINITY

ID lily099 /poli $wwrk(b05bfn00ld0p8) / b05bfn00ld0p8;    #<= b05bfn00
+ld0s0 Size:INFINITY

ID Steve9018 $work(b05bfn00ld0p7) /b05bfn00ld0p7;         #<= b05bfn00
+ld0s0 Size:INFINITY

__DATA2__
Accept => John06 / ext Max

Accept => vivian788 / ppr Maxcap

Accept => suzan645 / pp Min

Accept => lily099 / poli Max

Accept => Nick5670 / uu Max

Accept => Anne309 / pej Min

[download]

Update:
Awhoosh!!!, Loops, has similar solution in his Update.
If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me

In reply to Re: Perl: How to print unmatched data after comparison of two files? by 2teez
in thread Perl: How to print unmatched data after comparison of two files? by WWq

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