Sure. Consider: ./00000001/lines.txt 
1017,0,984,20030115,"18:07:54",20030301,191009,5975,3,0.00,0.00,27
1018,0,985,20030115,"18:09:19",20030301,191010,5311,3,0.00,0.00,27
1019,0,986,20030115,"18:10:49",20030301,191011,6370,3,0.00,0.00,27
1020,0,987,20030115,"18:13:32",20030301,191012,1022,3,0.00,0.00,30
1022,0,989,20030115,"18:18:28",20030301,191014,6618,3,0.00,0.00,27
1023,0,990,20030115,"18:19:59",20030301,191015,5081,3,0.00,0.00,27
1024,0,991,20030115,"18:21:08",20030301,191016,5763,3,0.00,0.00,27
1025,0,992,20030115,"18:21:39",20030301,191017,5650,3,0.00,0.00,30

[download]
./00000002/lines.txt 
1019,0,986,20030115,"18:10:49",20030301,191011,6370,3,0.00,0.00,27
1020,0,987,20030115,"18:13:32",20030301,191012,1022,3,0.00,0.00,30
1021,0,988,20030115,"18:18:09",20030301,191013,7191,3,0.00,0.00,30
1022,0,989,20030115,"18:18:28",20030301,191014,6618,3,0.00,0.00,27
1023,0,990,20030115,"18:19:59",20030301,191015,5081,3,0.00,0.00,27
1024,0,991,20030115,"18:21:08",20030301,191016,5763,3,0.00,0.00,27
1026,0,993,20030115,"18:21:47",20030301,191018,1125,3,0.00,0.00,27

[download]
The invoking line would look like this: 
$ ./missing.pl lines 1 2

[download]
(i've already noted bad output from the first "missing.pl" script, gosh!)

In reply to Re^2: Key-based diffs by haroldo
in thread Key-based diffs by haroldo

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