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Remove unused variables in shell scripts.
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Authored by Fabien on Aug 28 2019, 08:34.

Details

Summary
Remove unused variables in shell scripts. Use _ where we don't care
about the result.

Backport of core PR10771 and PR11649
https://github.com/bitcoin/bitcoin/pull/10771/files
https://github.com/bitcoin/bitcoin/pull/11649/files

Depends on D3955.

Not much change remaining as most of the files have been removed.

Test Plan

Run the git-subtree-check.sh script. It will not output GOOD as we
made changes to all the subtree libraries (at least code formatting).

Diff Detail

Repository
rABC Bitcoin ABC
Lint
Lint Not Applicable
Unit
Tests Not Applicable