#!/bin/bash

var1=(`ls *.txt`)

for i in ${var1[*]}
do
	pos=`expr index $i .`
	var2=`expr substr $i 1 $((pos-1))`
	mkdir $var2
	mv $i $var2
done

#!/bin/bash

i=1
j=1                                       
sum=0
while [ $i -le 9 ]
do
    j=1
    while [ $j -le 9 ]
    do
        ((sum=i*j))
        echo -n "$i*$j=$sum "
        if [ $j -eq $i ]
        then 
            break
        fi
        ((j=j+1))
    done
    ((i=i+1))
    echo ""
done

                                          

3.Xmind