git学习------>git-rev-parse命令初识

第一步：在d盘git test目录下，新建工作区根目录demo，进入该目录后，执行git init创建版本库。

DH207891+OuyangPeng@DH207891 MINGW32 /d/git test/demo (master)

$ echo "hello ." welcome.txt

DH207891+OuyangPeng@DH207891 MINGW32 /d/git test/demo (master)

total 1

-rw-r--r-- 1 DH207891+OuyangPeng 197609 8 6月 13 08:45 welcome.txt

DH207891+OuyangPeng@DH207891 MINGW32 /d/git test/demo (master)

$ git add welcome.txt

warning: LF will be replaced by CRLF in welcome.txt.

The file will have its original line endings in your working directory.

DH207891+OuyangPeng@DH207891 MINGW32 /d/git test/demo (master)

$ git st

On branch master

Initial commit

Changes to be committed:

 (use "git rm --cached file ..." to unstage)

 new file: welcome.txt


DH207891+OuyangPeng@DH207891 MINGW32 /d/git test/demo (master)

$ git ci -m "Initialized"

[master (root-commit) 89c9fa6] Initialized

 1 file changed, 1 insertion(+)

 create mode 100644 welcome.txt

DH207891+OuyangPeng@DH207891 MINGW32 /d/git test/demo (master)

$ git log

commit 89c9fa626e7d56c686e904ba34b8e21e9aaf43d8

Author: ouyangpeng oypcz@foxmail.com 

Date: Tue Jun 13 08:46:17 2017 +0800

 Initialized

第三步：在工作区中建立目录 a/b/c，进入到该目录中。

显示从当前目录(cd)后退(up)到工作区的根目录的深度，执行命令 git rev-parse --show-cdup

显示git环境变量列表的本地库,只列出变量的名称，而不是它们的值。执行命令git rev-parse --local-env-vars

DH207891+OuyangPeng@DH207891 MINGW32 /d/git test/demo/a/b/c (master)

$ git rev-parse --local-env-vars

GIT_ALTERNATE_OBJECT_DIRECTORIES

GIT_CONFIG

GIT_CONFIG_PARAMETERS

GIT_OBJECT_DIRECTORY

GIT_DIR

GIT_WORK_TREE

GIT_IMPLICIT_WORK_TREE

GIT_GRAFT_FILE

GIT_INDEX_FILE

GIT_NO_REPLACE_OBJECTS

GIT_REPLACE_REF_BASE

GIT_PREFIX

GIT_INTERNAL_SUPER_PREFIX

GIT_SHALLOW_FILE

GIT_COMMON_DIR

如果GIT_COMMON_DIR变量定义了则展示GIT_COMMON_DIR变量的值，不然则展示GIT_DIR变量的值

DH207891+OuyangPeng@DH207891 MINGW32 /d/git test/demo/a/b/c (master)

$ git rev-parse --symbolic --tags

目前还未建立TAG，所以没有值显示。

显示HEAD提交的SHA1值，执行命令git rev-parse HEAD，如下所示，先执行git log命令查看提交记录，再执行命令git rev-parse HEAD

DH207891+OuyangPeng@DH207891 MINGW32 /d/git test/demo/a/b/c (master) $ git rev-parse HEAD 89c9fa626e7d56c686e904ba34b8e21e9aaf43d8

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