[tahoe-lafs-trac-stream] [tahoe-lafs] #1897: CLI: add a way to change an existing alias without directly editing the aliases file

[tahoe-lafs]

#1897: CLI: add a way to change an existing alias without directly editing the
aliases file
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 Reporter:  davidsarah                     |          Owner:  davidsarah
     Type:  defect                         |         Status:  new
 Priority:  normal                         |      Milestone:  1.11.0
Component:  code-frontend-cli              |        Version:  1.9.2
 Keywords:  cli tahoe-add-alias usability  |  Launchpad Bug:
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 {{{tahoe add-alias}}} fails if the alias already exists, and so cannot be
 used to change an existing alias entry. There should be a command or
 option to do that (say, {{{tahoe add-alias --replace}}} or {{{tahoe
 replace-alias}}}), and the {{{tahoe add-alias}}} error message should say
 what it is.

 There is also no command to delete an alias.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1897>
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