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until statement
until 条件测试操作
do
命令序列
done
Test a certain condition repeatedly, and execute it repeatedly if the condition is not established.
On the contrary, once the condition is established, the execution will end.
Double loop
break
break out of a single loop
break out of a double loop
continue
Abort a command in a loop, but not completely abort the entire command
IFS field separator
Contains spaces, tabs, and newlines by default
set | grep IFS
