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You should be able to alias the string to something short. For example, I have

```
git config --global alias.a  'add .'
git config --global alias.ci commit
``` 
and so instead  of 

```
git add .
git commit -m'Message'
```
I can do

```
git a
git ci -m'Message'
```

In your case, it would be

```
git config --global alias.ci 'commit --amend --reset-author'
```
if I am understanding the question correctly.