cmd: handle errors well, throw non-zero exit code on error

Signed-off-by: Rohit Yadav <[email protected]>

Tagging release 5.3.3 on branch master.

Tagging release 5.3.2 on branch master.

Tagging release 5.3.1 on branch master.

Tagging release 5.3.0 on branch 5.3.

Tagging release 5.2.0 on branch 5.2.

Tagging release 5.1.0 on branch 5.1.0.

Tagging release 5.0.0 on branch 5.0.