vim aa.sh
#!/bin/bash
read -p "Please input the length: " len
for i in `seq 1 $len`
do
for((j=1;j<=$i;j++))
do
echo -n "* "
done
echo
done

sh aa.sh

vim aa.sh
#!/bin/bash
read -p "Please input the length: " len
for i in `seq 1 $len`
do
for((j=1;j<=$i;j++))
do
echo -n "* "
done
echo
done

sh aa.sh

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