带有 IF ELSE 语句的 BASH Shell 无限循环
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BASH Shell Infinite loop with IF ELSE Statment
提问by bikerben
Ok I know I've asked a similar question, I understand how to do an infinate loop:
好的，我知道我问过类似的问题，我了解如何进行无限循环：
while [ 1 ]
do
foo
bar
then
sleep 10
done
But if I want to run some (quite a few) IF ELSE Statements in this loop how would I get the script to carry on looping once they had completed how would I go about this?
但是，如果我想在这个循环中运行一些（相当多）IF ELSE 语句，一旦它们完成，我将如何让脚本继续循环，我将如何处理？
回答by Jan Hudec
while :; do
if cond1; then
whatever
elif cond2; then
something else
else
break
fi
done
- You do infinite loop using
while trueor using true's shorter alias:.[ 1 ]is needlessly complicated and is not what you think it is ([ 0 ]is also true!). Remember, the condition inifandwhileis arbitrary command whose exit status (zero = true, nonzero = false) is used as the condition value and[is just alias for specialtestcommand (both built-in in most shells, but they don't have to be). - Any shell construct is allowed between
do/doneincluding conditionals, more loops and cases. - Use
breakto terminate innermost loop from inside (just like most other languages).
- 您可以使用
while true或使用 true 较短的 alias进行无限循环:。[ 1 ]是不必要的复杂，不是您认为的那样（[ 0 ]也是如此！）。请记住，ifand 中的条件while是任意命令，其退出状态（零 = 真，非零 = 假）用作条件值，[并且只是特殊test命令的别名（在大多数 shell 中都内置，但它们不必是）。 - 允许在
do/done包括条件、更多循环和案例之间使用任何 shell 构造。 - 用于
break从内部终止最内层循环（就像大多数其他语言一样）。
回答by chown
An if in bash is just: if [ some test ]; then some_command; fi:
bash 中的 if 只是if [ some test ]; then some_command; fi：
while [ 1 ]
do
? ? if [ some test ]
then
some command
else
other cmd
fi
sleep 10
done
回答by mudrii
Correction to chown case added brake to finish the loop Corrected
修正 chown case 添加刹车以完成循环修正
while [ 1 ]
do
if [ some test ]
then
some command
brake
else
other cmd
fi
sleep 10
done
