多對資料倉儲進行修改、提交操作，以產生多個版本
[root@client project]
# echo "new file" > new.txt
[root@client project]
# git add .
[root@client project]
# git commit -m "add new.txt"
[root@client project]
# echo "first" >> new.txt
[root@client project]
# git add .
[root@client project]
# git commit -m "new.txt:first line"
[root@client project]
# echo "second" >> new.txt
[root@client project]
# git add .
[root@client project]
# git commit -m "new.txt:second"
[root@client project]
# echo "third" >> new.txt
[root@client project]
# git add .
[root@client project]
# git commit -m "new.txt:third"
[root@client project]
# git push
[root@client project]
# echo "123" > num.txt
[root@client project]
# git add .
[root@client project]
# git commit -m "num.txt:123"
[root@client project]
# echo "456" > num.txt
[root@client project]
# git add .
[root@client project]
# git commit -m "num.txt:456"
[root@client project]
# echo "789" > num.txt
[root@client project]
# git add .
[root@client project]
# git commit -m "num.txt:789"
[root@client project]
# git push
[root@client project]
# git log --pretty=oneline
bc342702c0ec2cc8ea070b859657c1162079404e num.txt:789
5cd5009d4de93630d68fc6f0fd471ad9dec2d571 num.txt:456
9facc5f5d36eb5259c67e046b0bae276452d4ef3 num.txt:123
38186bcc0c492d73329b74b777ec920bc1d0a981 new.txt:third
bf54a2e0e8f1de8742490a650aae4ff177390c3a new.txt:second
18c9e29d142c4d87034cba203eb234b845a04e8f new.txt:first line
ba078651a4d62f5476eb39f78f7fd966e6a2073c add.new.txt
5ffa75da29cceec8582006c91790f9994169ccd9 注釋，可以為任意字元
ff470ad0020a9ead67c8ac416369d2a1c8906d69 注釋，可以為任意字元
[root@client project]
# git reflog
bc34270 head@: commit: num.txt:789
5cd5009 head@: commit: num.txt:456
9facc5f head@: commit: num.txt:123
38186bc head@: commit: new.txt:third
bf54a2e head@: commit: new.txt:second
18c9e29 head@: commit: new.txt:first line
ba07865 head@: commit: add.new.txt
5ffa75d head@: pull: fast-forward
ff470ad head@: commit (initial): 注釋，可以為任意字元
[root@client project]
# git reset --hard 9facc5f
head 現在位於 9facc5f num.txt:123
[root@client project]
# git reflog #檢視指標移動歷史
9facc5f head@: reset: moving to 9facc5f
bc34270 head@: commit: num.txt:789
5cd5009 head@: commit: num.txt:456
9facc5f head@: commit: num.txt:123
38186bc head@: commit: new.txt:third
bf54a2e head@: commit: new.txt:second
18c9e29 head@: commit: new.txt:first line
ba07865 head@: commit: add.new.txt
5ffa75d head@: pull: fast-forward
ff470ad head@: commit (initial): 注釋，可以為任意字元
[root@client project]
# cat num.txt #檢視檔案是否為123
123[root@client project]
# git reset --hard 5cd5009
head 現在位於 5cd5009 num.txt:456
[root@client project]
# git reflog #檢視指標移動歷史
5cd5009 head@: reset: moving to 5cd5009
9facc5f head@: reset: moving to 9facc5f
bc34270 head@: commit: num.txt:789
5cd5009 head@: commit: num.txt:456
9facc5f head@: commit: num.txt:123
38186bc head@: commit: new.txt:third
bf54a2e head@: commit: new.txt:second
18c9e29 head@: commit: new.txt:first line
ba07865 head@: commit: add.new.txt
5ffa75d head@: pull: fast-forward
ff470ad head@: commit (initial): 注釋，可以為任意字元
[root@client project]
# cat num.txt #檢視檔案是否為456
456[root@client project]
# git reset --hard bc34270 #回到最後一次修改的版本
head 現在位於 bc34270 num.txt:789
[root@client project]
# git reflog #檢視指標移動歷史
bc34270 head@: reset: moving to bc34270
5cd5009 head@: reset: moving to 5cd5009
9facc5f head@: reset: moving to 9facc5f
bc34270 head@: commit: num.txt:789
5cd5009 head@: commit: num.txt:456
9facc5f head@: commit: num.txt:123
38186bc head@: commit: new.txt:third
bf54a2e head@: commit: new.txt:second
18c9e29 head@: commit: new.txt:first line
ba07865 head@: commit: add.new.txt
5ffa75d head@: pull: fast-forward
ff470ad head@: commit (initial): 注釋，可以為任意字元
[root@client project]
# cat num.txt #檢視檔案是否為789
789
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