[MacPorts] #68638: When a "command not found" situation happens, Bash prints errors and ends with "Abort Trap: 6" instead of printing "Command not found"

[MacPorts]

#68638: When a "command not found" situation happens, Bash prints errors and ends
with "Abort Trap: 6" instead of printing "Command not found"
----------------------+--------------------
  Reporter:  some1so  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  bash     |
----------------------+--------------------
Description changed by some1so:

Old description:

> For example, using 'derp' as a fake command (macports 5.2.15(1)-release):
> ~ $ derp
> objc[75690]: +[__SwiftNativeNSStringBase initialize] may have been in
> progress in another thread when fork() was called.
> objc[75690]: +[__SwiftNativeNSStringBase initialize] may have been in
> progress in another thread when fork() was called. We cannot safely call
> it or ignore it in the fork() child process. Crashing instead. Set a
> breakpoint on objc_initializeAfterForkError to debug.
> Abort trap: 6
>
> expected behavior (Apple supplied 3.2.57):
> ~ $ derp
> bash: derp: command not found
> ~ $

New description:

 For example, using 'derp' as a fake command (macports 5.2.15(1)-release):
 {{{
 ~ $ derp
 objc[75690]: +[__SwiftNativeNSStringBase initialize] may have been in
 progress in another thread when fork() was called.
 objc[75690]: +[__SwiftNativeNSStringBase initialize] may have been in
 progress in another thread when fork() was called. We cannot safely call
 it or ignore it in the fork() child process. Crashing instead. Set a
 breakpoint on objc_initializeAfterForkError to debug.
 Abort trap: 6
 }}}


 expected behavior (Apple supplied 3.2.57):
 {{{
 ~ $ derp
 bash: derp: command not found
 ~ $
 }}}

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Ticket URL: <https://trac.macports.org/ticket/68638#comment:1>
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