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for i in {1..24}
do
...
echo "chr$i"
date
done

system("for i in {1..24}
do
...
echo "chr$i"
date
done");

`for i in {1..24}
do
...
echo "chr$i"
date
done`;

#!/usr/bin/perl -w
# pipe.test.pl
...
}
close IN;
close OUT;

chr1    100    159    104    104    1    0.05    +
chr1    100    159    145    145    0    0.04    +
chr1    200    260    205    205    1    0.12    +
chr1    500    750    600    600    1    0.09    +
chr1    800    900    600    600    1    0.09    +

chr2    100    200    105    105    1    0.03    +
chr2    100    200    110    110    1    0.08    +
chr2    300    400    350    350    0    0    +