使用git时，错误集锦

1：输入git checkout -b comment origin/comment报错

fatal: 'origin/comment' is not a commit and a branch 'comment' cannot be created from it
原因：远程没有这个分支
如果远程有这个分支，还是不能创建，使用以下：

git remote        # 列出所有远程主机
git remote update origin --prune   # 更新远程主机origin 整理分支
git branch -r      # 列出远程分支
git branch -vv     # 查看本地分支和远程分支对应关系
git checkout -b comment origin/comment    # 新建本地分支comment与远程comment分支相关联

 2.git pull或push 每次都要Enter passphrase for key '/c/Users/Administrator/.ssh/id_rsa':

使用以下命令：

ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]
ssh-keygen -p -P XXXXXX -N '' -f ~/.ssh/id_rsa

如果不生效的话： 

PS E:\StuXXXXXXX-fe> ssh-keygen -p
Enter file in which the key is (C:\Users\Administrator/.ssh/id_rsa): ~/.ssh/id_rsa
~/.ssh/id_rsa: No such file or directory
PS E:\StuXXXXXXX-fe> ssh-keygen -p
Enter file in which the key is (C:\Users\Administrator/.ssh/id_rsa): C:\Users\Administrator\.ssh\id_rsa
Enter old passphrase:
Key has comment 'qq邮箱地址'
Enter new passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved with the new passphrase.