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Add PAL_DBG_CHANNELS note
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docs/debugging/README.md

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The native executable prouduced by .NET CLI will produce trace output
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if launched with `COREHOST_TRACE=1 ./powershell`.
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CoreCLR PAL
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-----------
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The native code in the CLR has debug channels to selectively output
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information to the console. These are controlled by the
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`PAL_DBG_CHANNELS`, e.g., `export PAL_DBG_CHANNELS="+all.all"`, as
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detailed in the `dbgmsg.h` [header][].
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[header]: https://github.com/dotnet/coreclr/blob/release/1.0.0-rc2/src/pal/src/include/pal/dbgmsg.h

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