git shelve doesn’t exist in Git.
Only git stash:
- when you want to record the current state of the working directory and the index, but want to go back to a clean working directory.
- which saves your local modifications away and reverts the working directory to match the HEAD commit.
You had a 2008 old project git shelve to isolate modifications in a branch, but that wouldn’t be very useful nowadays.
As documented in Intellij IDEA shelve dialog, the feature “shelving and unshelving” is not linked to a VCS (Version Control System tool) but to the IDE itself, to temporarily storing pending changes you have not committed yet in changelist.
Note that since Git 2.13 (Q2 2017), you now can stash individual files too.