character variable substring
... 字符变量名 character variable name 字符变量子串 character variable substring 字符标记符 character marker ...
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We can use another form of variable expansion to select a specific substring, based on a specific character offset and length. Try typing in the following lines under bash.
可以根据特定字符偏移和长度，使用另一种形式的变量扩展，来选择特定子字符串。
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