Content of file used as argument to --filter, containing the filter criteria (all stations in WMO block 11 and two specific stations in WMO block 10):

D: 001001
11
D: 001001 001002
10 28
10 261

Output:

Message 1 ISMD42 EDZW 020600
Subset 1
1 001001 10 WMO BLOCK NUMBER [NUMERIC]
2 001002 28 WMO STATION NUMBER [NUMERIC]
3 001015 Sankt Peter-Ord STATION OR SITE NAME [CCITTIA5]
4 010051 101360 PRESSURE REDUCED TO MEAN SEA LEVEL [PA]
5 012101 291.15 TEMPERATURE/DRY-BULB TEMPERATURE [K]
6 011001 110 WIND DIRECTION [DEGREE TRUE]
7 011002 6.2 WIND SPEED [M/S]
Subset 3
1 001001 10 WMO BLOCK NUMBER [NUMERIC]
2 001002 261 WMO STATION NUMBER [NUMERIC]
3 001015 Seehausen STATION OR SITE NAME [CCITTIA5]
4 010051 101570 PRESSURE REDUCED TO MEAN SEA LEVEL [PA]
5 012101 291.55 TEMPERATURE/DRY-BULB TEMPERATURE [K]
6 011001 120 WIND DIRECTION [DEGREE TRUE]
7 011002 4.9 WIND SPEED [M/S]
Message 6 ISMD16 OKPR 020600
Subset 1
1 001001 11 WMO BLOCK NUMBER [NUMERIC]
2 001002 406 WMO STATION NUMBER [NUMERIC]
3 001015 Cheb STATION OR SITE NAME [CCITTIA5]
4 010051 101500 PRESSURE REDUCED TO MEAN SEA LEVEL [PA]
5 012101 291.95 TEMPERATURE/DRY-BULB TEMPERATURE [K]
6 011001 0 WIND DIRECTION [DEGREE TRUE]
7 011002 1 WIND SPEED [M/S]
Subset 2
1 001001 11 WMO BLOCK NUMBER [NUMERIC]
2 001002 414 WMO STATION NUMBER [NUMERIC]
3 001015 Karlovy Vary STATION OR SITE NAME [CCITTIA5]
4 010051 missing PRESSURE REDUCED TO MEAN SEA LEVEL [PA]
5 012101 292.35 TEMPERATURE/DRY-BULB TEMPERATURE [K]
6 011001 270 WIND DIRECTION [DEGREE TRUE]
7 011002 1 WIND SPEED [M/S]
Subset 3
1 001001 11 WMO BLOCK NUMBER [NUMERIC]
2 001002 438 WMO STATION NUMBER [NUMERIC]
3 001015 Tusimice STATION OR SITE NAME [CCITTIA5]
...