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posix mode changes for interp 1150; fix for varassign redirection; fix for nameref in ${param=value} expansion
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@@ -8561,6 +8561,13 @@ undergoes expansion.
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That means, for example, that a backslash preceding a double quote
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character will escape it and the backslash will be removed.
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@item
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Command substitutions don't set the @samp{?} special parameter. The exit
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status of a simple command without a command word is still the exit status
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of the last command substitution that occurred while evaluating the variable
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assignments and redirections in that command, but that does not happen until
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after all of the assignments and redirections.
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@end enumerate
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There is other @sc{posix} behavior that Bash does not implement by
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