Shell finishing (32) = = = Two small examples of nested loops

(1) The shell prints the pattern as shown.

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The shell code is as follows:

#!/bin/bash

echo "-"

For i in ' seq 9 '

Do

For x in ' seq $i '

Do

Echo-n ""

Done

echo "|"

Echo

For y in ' seq $i '

Do

Echo-n ""

Done

echo "-"

Done

echo "|"

Echo

Two

A ball from 100 meters height of the free fall, each landing after jumping back to the original height of half, and then fall, begging for it in the 10th time on the landing, total after how many meters? How high is the 10th rebound?

The shell code is as follows

#!/bin/bash

x=100

For i in ' seq 10 '

Do

x= ' awk ' begin{printf ' $x '/2} '

Done

Echo $x

Output Result:

[Email protected] ding]# bash 22.sh

0.097656

[Email protected] ding]#

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Shell finishing (32) = = = Two small examples of nested loops