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。
Gets the character offset of the object.
获取对象的字符偏移量。
Moves the active point to the given 1-based absolute character offset.
将活动点移动到给定的基于1的绝对字符偏移位置。
Moves the active point to the given 1-based absolute character offset.
将活动点移动到给定的基于1的绝对字符偏移位置。
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