Dear list,

Sorry if this is a really simple question to ask, but I have been stuck at
this for some time and have no luck so far.

I have 2 data files- a file containing IDs which I am interested in (maybe
about 20 of them)- lets call this file A, and another file containing all
the IDs (which is more than 1 million) and the corresponding expression
values- lets call this file B.

So for example, this is how file B looks like:

2534215 4.73483 3.06499 0.70032 2.20247 2.57014 2.68004 5.20362 4.56531
5.53275 4.6597 4.49301 3.26696 4.45926 3.33294 4.91008 4.69106 2.80828
3.85168 4.31348 3.84926
2620456 7.13062 7.40361 7.41215 7.12816 6.03347 7.77204 8.37129 8.4811
8.4156 8.48804 8.33357 7.77168 7.60426 7.0769 8.06268 7.4646 6.29976 6.76743
7.41375 7.30186
2830090 0.54261 2.14015 2.30475 1.85821 0.46711 0.92093 0.77438 0.94734
0.68643 0.57625 0.72098 0.988 2.11342 0.4447 0.3774 0.67744 2.0072 1.90465
0.87868 0.5177
2575215 3.40684 2.08213 1.69333 3.01074 2.28529 1.9541 2.14518 1.67518
2.83476 3.28296 2.21263 2.46864 3.30994 2.42013 5.22249 1.98937 2.09089
1.94941 2.43488 3.59808
2849041 1.48954 3.91934 1.7037 1.77033 1.54604 0.93467 0.96066 2.24328
2.92171 2.15935 0.42652 1.46658 1.49061 1.72481 1.09684 0.98344 1.83167
2.10103 2.40971 0.84771
3102546 5.88775 5.67887 5.42377 3.45853 4.99174 3.04696 5.29118 4.43669
5.18792 5.34072 5.06025 3.25504 5.50719 5.92674 4.71267 5.51699 3.54069
5.28343 6.36131 4.7219
2925428 1.55075 1.74401 2.07019 2.13188 0.8098 1.40341 0.99192 1.39257
0.51152 2.50187 1.39294 1.29555 0.67688 1.2912 1.75177 1.61535 1.31611
0.91411 1.1937 0.79358
2372272 7.69508 7.32337 7.47569 7.13584 5.86709 6.15057 8.03573 7.77657
7.93019 7.6854 8.23643 3.42619 8.90083 9.18137 8.54825 7.39468 7.88283
8.08621 8.41234 8.23991
3360788 1.8126 3.57725 1.68462 2.83186 2.29188 1.723 2.27151 3.57716 3.12974
1.7842 2.49073 3.42127 1.52801 2.43608 2.38312 4.10846 2.34492 1.68719
0.87868 2.5681
3443892 6.03618 5.53088 3.59312 2.43822 4.67525 2.89741 3.57465 3.25502
3.30023 3.06377 3.4388 2.31478 4.74265 5.6276 2.82511 4.8615 5.65537 5.93262
6.29311 6.13882
3298798 1.16559 2.3974 1.28858 0.566 0.74531 0.93919 2.68312 1.20792 1.48076
1.69595 1.67204 0.5811 1.02014 0.84925 1.54777 1.30054 2.14382 3.31986
1.19556 2.7532
3019819 1.73561 3.53995 2.28098 1.91677 3.64978 2.23223 2.39018 1.66967
2.60563 2.82343 3.60435 1.7998 1.10665 1.42922 1.60167 1.39237 3.08337
1.07063 2.08086 1.9265
3173936 1.55062 1.50538 1.87352 1.83726 3.59104 2.50134 0.71658 2.07377
1.50345 2.71367 1.68669 2.05536 1.88829 0.86234 0.80113 2.2544 0.86643
2.03882 1.53434 1.46399
2424908 0.42785 1.66894 2.27908 2.99882 3.284 1.99961 0.79164 0.44145
1.40957 2.05127 1.40553 3.38542 0.82951 1.06653 1.43876 2.15272 0.69042
0.66962 2.02502 0.7646

And this is how file A looks like:
2620456
2830090
2575215
2849041

How do I actually extract and export the corresponding values for A in B?

Thanks in advanced!
Jeremy

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