mpsh$ command args &

mpsh allows a number of options to background jobs, specified after the ampersand.

Any letter will be assumed to be a job handler (see job handler section):

mpsh$ command args &x

A number, star, or exclamation point specify a multi-process job (see multi-process job section):

mpsh$ command args &4

Minus signs causes a job to run at lower priority. Multiple minuses increase the "niceness" level. The actual value is controlled by the mpsh-nice environment variable.

mpsh$ command args &--

All of these options can be combined.