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The zstd symlinks, notably `zstdcat`, weren't working as expected because only the `tests/cli-tests/bin/zstd` wrapper was symlinked. We still invoked `zstd` with the name `zstd`. The fix is to create a directory of zstd symlinks in `tests/cli-tests/bin/symlinks` for each name that zstd recognizes. And when `tets/cli-tests/bin/zstd` is invoked, it selects the correct symlink to call. See the test `zstd-cli/zstdcat.sh` for an example of how it would work.