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limit how much data we read from a command substitution #3822

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@krader1961

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@krader1961

At the moment we don't impose any limits on the amount of data that we accept from read or a command substitution (e.g., (cmd)). Issue #3712 proposes setting a limit of 100 MiB for any single read execution. This issue is to discuss whether the same, or a similar, limit should be imposed on command substitution output. See issue #3817 for examples of what can happen without such a limit.

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