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Adding a positional argparse.ONE_OR_MORE arguments will correctly remove the "--" separator after --env and parse only the command. This also has the advantage that misspelled flags raise an argparse error rather than silently being added to the command to be executed. I discovered this while adding a new commandline option to ssh.py to allow passing additional arguments to the scp/ssh commands since this is required for our CHERI CI where we need to pass `-F <custom_config_file>` to each ssh/scp command to set various arguments such as the localhost port, usage of controlmaster, etc. to speed up connections to our emulated QEMU systems. Reviewed By: #libc, ldionne Differential Revision: https://reviews.llvm.org/D84096