[MacPorts] #40686: bash-completion: support port abbreviated commands

[MacPorts]

#40686: bash-completion: support port abbreviated commands
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 Reporter:  ryandesign@…  |      Owner:  raimue@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  bash-completion
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 With bash-completion, I can type {{{port contents z}}} then press tab
 twice to see the names of all the ports I have installed that begin with
 "z". However if I use an abbreviated form like {{{port cont z}}} then
 pressing tab any number of times just beeps.

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Ticket URL: <https://trac.macports.org/ticket/40686>
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