Create a copy of each version of a file in a git repository

Question

I want to copy each committed version of InterestingFile.cpp to a directory.

The destination file should have its commit timestamp as filename (like /tmp/AllVersions/1495035445)

The following example works, but requires a helper.sh script. How can I write in one line without helper script?

$ git rebase -i --exec "~/helper.sh ~/InterestingFile.cpp" --preserve-merges 0123ABCD


$ cat ~/helper.sh  
#!/bin/bash
TIMESTAMP=`git show -s --format=%ct HEAD` 
cp $1 /tmp/AllVersions/${TIMESTAMP}


$ ls -1 /tmp/AllVersions  # here are the files finally
1499951860
1500038126
1500040256
1500363092

Answer 1

git rebase -i --exec "cp ~/InterestingFile.cpp /tmp/AllVersions/$(git show -s --format=%ct HEAD)" --preserve-merges 0123ABCD