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1392793334
Fish is different from POSIX-based Unix shells such as bash,
and a bracketed variable references like we use for the
auto-detection echo command is not supported. The command
will return with zero exit code but produce no output on
stdout. There is a message on stderr, but we don't log it
due to the zero exit code:
fish: Variables cannot be bracketed. In fish, please use {$ShellId}.
Fixes #6552