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docs: mention HYPERFINE_ITERATION in README #900

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docs: mention HYPERFINE_ITERATION in README #900

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Expand Up @@ -87,6 +87,12 @@ option:
hyperfine -L compiler gcc,clang '{compiler} -O2 main.cpp'
```

If you need a unique value for each individual run of a benchmark command, hyperfine also exposes
the zero-based `$HYPERFINE_ITERATION` environment variable inside the benchmarked command itself:
```sh
hyperfine 'my-command > output-${HYPERFINE_ITERATION}.log'
```

### Intermediate shell

By default, commands are executed using a predefined shell (`/bin/sh` on Unix, `cmd.exe` on Windows).
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