<>用shell脚本输出99乘法表

<>效果：
1 * 1 = 1 1 * 2 = 2 2 * 2 = 4 1 * 3 = 3 2 * 3 = 6 3 * 3 = 9 1 * 4 = 4 2 * 4 =
8 3 * 4 = 12 4 * 4 = 16 1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25 1
* 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36 1 * 7 = 7 2 * 7
= 14 3 * 7 = 21 4 * 7 = 28 5 * 7 = 35 6 * 7 = 42 7 * 7 = 49 1 * 8 = 8 2 * 8 =
16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8 = 48 7 * 8 = 56 8 * 8 = 64 1 * 9 = 9
2 * 9 = 18 3 * 9 = 27 4 * 9 = 36 5 * 9 = 45 6 * 9 = 54 7 * 9 = 63 8 * 9 = 72 9
* 9 = 81
<>脚本：

<>写法1：
#!/bin/bash for x in `seq 9` do for y in `seq \$x` do printf "\$y * \$x = \$((\$x *
\$y))\t" done printf "\n" done
<>写法2：
#!/bin/bash for ((x=1;x<=9;x++)) do for ((y=1;y<=\$x;y++)) do printf "\$y * \$x =
\$((\$x * \$y))\t" done printf "\n" done
<>写法3：
#!/bin/bash for x in {1..9} do for ((y=1;y<=\$x;y++)) do printf "\$y * \$x = \$((\$x
*\$y))\t" done printf "\n" done
<>倒状的九九乘法表

<>效果：
1 * 9 = 9 2 * 9 = 18 3 * 9 = 27 4 * 9 = 36 5 * 9 = 45 6 * 9 = 54 7 * 9 = 63 8
* 9 = 72 9 * 9 = 81 1 * 8 = 8 2 * 8 = 16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8
= 48 7 * 8 = 56 8 * 8 = 64 1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 4 * 7 = 28 5 * 7 =
35 6 * 7 = 42 7 * 7 = 49 1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30
6 * 6 = 36 1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25 1 * 4 = 4 2 *
4 = 8 3 * 4 = 12 4 * 4 = 16 1 * 3 = 3 2 * 3 = 6 3 * 3 = 9 1 * 2 = 2 2 * 2 = 4 1
* 1 = 1
<>写法1：
#!/bin/bash for ((x=9;x>0;x--)) do for ((y=1;y<=\$x;y++)) do printf "\$y * \$x =
\$((\$x * \$y))\t" done printf "\n" done

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