28 lines
1.3 KiB
Markdown
28 lines
1.3 KiB
Markdown
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# BusyBox for Windows — the shell behind `@eval :shell` on Windows
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`busybox64u.exe` is [BusyBox for Windows](https://frippery.org/busybox/)
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(busybox-w32) by Ron Yorston, release **FRP-6075-g169694ebd** of
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2026-05-07, the 64-bit Unicode build, downloaded from
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`https://frippery.org/files/busybox/busybox64u.exe` on 2026-09-24.
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sha256 6e263d154d8548d1eb936f65d1d8312c80df31c45974e48d6335e4dcc0f4f34c
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size 675840 bytes
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## Why it is here
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On Linux and macOS `popen()` runs a `:shell` command with `/bin/sh`, so
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`@eval :shell …` has always meant a POSIX shell command. On Windows
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`popen()` runs `cmd.exe`, a different language, and the same document would
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mean something else. Klammertext therefore runs `:shell` commands on
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Windows with this `sh` (`mac/eval.cpp`, `shell_command_line()`), and a
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document's `:shell` command means the same thing on every system.
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## Licence
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BusyBox is distributed under the GNU General Public License version 2
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(`LICENSE`, the copy from the busybox-w32 repository). Klammertext invokes
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it as a separate program and does not link against it. The corresponding
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source is the busybox-w32 repository, `https://github.com/rmyorston/busybox-w32`,
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at the release above; anyone who receives this binary from a Klammertext
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distribution is entitled to that source under the GPL, and this file is the
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written offer's pointer.
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