linux-tutorial/codes/shell/demos/statement/while-demo.sh

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#!/usr/bin/env bash
### 0到9之间每个数的平方
x=0
### x小于10
while [[ ${x} -lt 10 ]]; do
echo $((x * x))
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x=$((x + 1))
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done
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# Output:
# 0
# 1
# 4
# 9
# 16
# 25
# 36
# 49
# 64
# 81