BUG: fix use of flag -o
BUG: fix use of flag -o

Former-commit-id: b03ba81bc8f66e59709c3fbe09a0b7f74a4ce94e [formerly 980a7cb1aef10ea9c22fcd33da40f244520aafb9]
Former-commit-id: d88234866bd17ff1deef51b3d2a41a8cca5164b1
Former-commit-id: c4283e3635e2daac382b290eda3cda5b5b6b23fa
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox