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Example 4-4
insn_tree.bash
mkdir INSN_DATA
cd INSN_DATA
cat ../insn.stn |while
read station
do
echo $station
mkdir $station
cd $station
for year in `seq 2004 2013`
do
mkdir $year
cd $year
for month in 01 02 03 04 05 06 07 08 09 10 11 12
do
mkdir $month
done
cd ..
done
cd ..
done
cd