tilda和插入符号在git中与HEAD有什么关系？ [重复]

Question

此问题已经在这里有了答案：

• What's the difference between HEAD^ and HEAD~ in Git?14个答案
• HEAD~ vs HEAD^ vs HEAD@{} also known as tilde vs caret vs at sign3个答案

[我看到有些人对HEAD使用插入符号和tilda符号，例如HEAD ^或HEAD〜（NUMBER VALUE），但我不太了解。

Answer 1

来自rev-parse文档：

   <rev>^, e.g. HEAD^, v1.5.1^0
       A suffix ^ to a revision parameter means the first parent of that commit object.  ^<n> means the <n>th
       parent (i.e.  <rev>^ is equivalent to <rev>^1). As a special rule, <rev>^0 means the commit itself and
       is used when <rev> is the object name of a tag object that refers to a commit object.

   <rev>~<n>, e.g. master~3
       A suffix ~<n> to a revision parameter means the commit object that is the <n>th generation ancestor of
       the named commit object, following only the first parents. I.e.  <rev>~3 is equivalent to <rev>^^^ which
       is equivalent to <rev>^1^1^1. See below for an illustration of the usage of this form.