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#!/bin/rc
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rfork e
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# 0000000  eb 3c 90  P  l  a  n  9  .  0  0 00 02 04 02 00
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# 0000010  02 00 02 02  P f8 14 00  ? 00 ff 00  ~ 04  } 00
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# 0000020  02  P 00 00 80 00  ) a8 04  } 00  C  Y  L  I  N
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# 0000030   D  R  I  C  A  L  F  A  T  1  6          fa 8c
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if(! ~ $#* 1) {
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	echo 'usage: isfat /dev/sdC0/part' >[1=2]
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	exit usage
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}
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arg=$1
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fn fat {
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	cmp -s <{dd -if $arg -bs 1 -count 3 -skip $1 >[2]/dev/null} <{echo -n FAT}
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}
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fat 54 || fat 82
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exit $status
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