Racket 简介
Racket 是一种多范式编程语言，源自 Scheme 语言，主要用于教学、研究和软件开发。它具有以下几个显著特点：
-
多范式支持：Racket 支持函数式编程、命令式编程和面向对象编程，允许开发者根据需求选择合适的编程风格。
-
强大的宏系统：Racket 提供了强大的宏系统，允许开发者创建新的语言和语法扩展，使得编写 DSL（领域特定语言）变得更加容易。
-
丰富的库和工具：Racket 拥有丰富的标准库和第三方库，支持图形界面、网络编程、数据库访问等多种功能。
-
教学友好：Racket 被广泛用于计算机科学教育，特别是在编程语言和计算机科学基础课程中。它的设计旨在帮助学生理解编程的基本概念。
-
跨平台支持：Racket 可以在多种操作系统上运行，包括 Windows、macOS 和 Linux。
在FreeBSD下安装racket
先查找一下FrreeBSD下的Racket包：
pkg search racket
racket-minimal-8.11.1_1 Interactive, integrated, graphical Scheme programming environment安装
sudo pkg install racket-minimal安装完成！
但是 raco pkg install sha 报错，没装成。
Windows下安装Racket
到网站下载软件
官网下载：Download Racket
清华源下载：Racket: Index
下载后，直接双击打开，报安全信息不让执行。
到power shell里去执行：
E:\360Downloads> .\racket-8.15-x86_64-win32-cs.exe后面就是windows下的安装步骤，一步步确定即可。
安装好后，点图标运行racket
运行DrRacket，安装sha包，这个是成功的
Resolving "sha" via https://download.racket-lang.org/releases/8.15/catalog/
Resolving "sha" via https://pkgs.racket-lang.org
Downloading repository github://github.com/greghendershott/sha/master commit f9472bea67e05e8c11dc915e943038d3a7276a9b
raco setup: version: 8.15
raco setup: platform: win32\x86_64 [cs]
raco setup: target machine: ta6nt
raco setup: installation name: 8.15
raco setup: variants: cs
raco setup: main collects: E:\Program Files\Racket\collects\
raco setup: collects paths:
raco setup: C:\Users\Admin\AppData\Roaming\Racket\8.15\collects
raco setup: E:\Program Files\Racket\collects\
raco setup: main pkgs: E:\Program Files\Racket\share\pkgs
raco setup: pkgs paths:
raco setup: E:\Program Files\Racket\share\pkgs
raco setup: C:\Users\Admin\AppData\Roaming\Racket\8.15\pkgs
raco setup: links files:
raco setup: E:\Program Files\Racket\share\links.rktd
raco setup: C:\Users\Admin\AppData\Roaming\Racket\8.15\links.rktd
raco setup: main docs: E:\Program Files\Racket\doc
raco setup: --- updating info-domain tables --- [10:22:17]
raco setup: updating: C:\Users\Admin\AppData\Roaming\Racket\8.15\share\info-cache.rktd
raco setup: --- pre-installing collections --- [10:22:17]
raco setup: --- installing foreign libraries --- [10:22:17]
raco setup: --- installing shared files --- [10:22:17]
raco setup: --- compiling collections --- [10:22:17]
raco setup: --- parallel build using 8 jobs --- [10:22:17]
raco setup: 7 making: <pkgs>/sha/sha
raco setup: --- creating launchers --- [10:22:21]
raco setup: --- building documentation --- [10:22:21]
raco setup: 6 running: <pkgs>/racket-index/scribblings/main/user/local-redirect.scrbl
raco setup: 7 running: <pkgs>/racket-index/scribblings/main/user/release.scrbl
raco setup: 4 running: <pkgs>/sha/sha/sha.scrbl
raco setup: 0 running: <pkgs>/racket-index/scribblings/main/user/search.scrbl
raco setup: 3 running: <pkgs>/racket-index/scribblings/main/user/start.scrbl
raco setup: 4 rendering: <pkgs>/racket-index/scribblings/main/user/local-redirect.scrbl
raco setup: 3 rendering: <pkgs>/racket-index/scribblings/main/user/release.scrbl
raco setup: 2 rendering: <pkgs>/racket-index/scribblings/main/user/search.scrbl
raco setup: 1 rendering: <pkgs>/sha/sha/sha.scrbl
raco setup: 0 rendering: <pkgs>/racket-index/scribblings/main/user/start.scrbl
raco setup: --- installing collections --- [10:22:41]
raco setup: --- post-installing collections --- [10:22:41]
但是不知道该怎么在命令行使用....比如怎么执行Arc.sh ?
Ubuntu24.04下安装最新版
为了安装最新版，就不用apt install 安装了，而是直接从官网下载。当然可以从清华源下载：
Racket: Index
下载racket-8.15-x86_64-linux-cs.sh
执行安装，安装成功！
Target Directories:[e] Executables /home/skywalk/bin (will be created)[o] Libraries /home/skywalk/lib/racket (will be created)[s] Shared files /home/skywalk/share/racket (will be created)[c] Configuration /home/skywalk/etc/racket (will be created)[d] Documentation /home/skywalk/share/racket/doc (will be created)[a] .desktop files /home/skywalk/share/applications (will be created)[m] Man Pages /home/skywalk/share/man (will be created)[l] C Libraries /home/skywalk/lib (will be created)[h] C headers /home/skywalk/include/racket (will be created)[z] Compiled at lib? yes
Enter a letter to change an entry, or enter to continue.
>Checking the integrity of the binary archive... ok.
Unpacking into "/home/skywalk/racket-tmp-install" (Ctrl+C to abort)...
Done.
Moving bin -> /home/skywalk/bin
Moving collects -> /home/skywalk/share/racket/collects
Moving share/pkgs -> /home/skywalk/share/racket/pkgs
Moving doc -> /home/skywalk/share/racket/doc
Moving lib -> /home/skywalk/lib/racket
Moving include -> /home/skywalk/include/racket
Moving share/applications -> /home/skywalk/share/applications
Moving share -> /home/skywalk/share/racket
Moving etc -> /home/skywalk/etc/racket
Moving man -> /home/skywalk/share/man
Moving README -> /home/skywalk/share/racket/doc/README
Writing uninstaller at: /home/skywalk/bin/racket-uninstall...
Rewriting configuration file at: /home/skywalk/etc/racket/config.rktd...
Moving "compiled" in /home/skywalk/share/racket/collects to /home/skywalk/lib/racket/compiled/home/skywalk/share/racket/collects
Moving "compiled" in /home/skywalk/share/racket/pkgs to /home/skywalk/lib/racket/compiled/home/skywalk/share/racket/pkgs
Rewriting configuration file at: /home/skywalk/etc/racket/config.rktd...Installation complete.但是用raco 测试了一下，还是识别是8.10版本....
raco pkg install sha
重开了一个终端，又执行raco setup
然后执行
raco pkg install sha这回能看到是8.15版本了。
但还是报错： system error: Connection reset by peer; errno=104
raco pkg install sha
Resolving "sha" via https://download.racket-lang.org/releases/8.15/catalog/
Resolving "sha" via https://pkgs.racket-lang.org
error reading from stream portsystem error: Connection reset by peer; errno=104context...:/home/skywalk/share/racket/collects/openssl/mzssl.rkt:950:0: pump-input-once/home/skywalk/share/racket/collects/openssl/mzssl.rkt:1413:0: wrap-ports/home/skywalk/share/racket/collects/racket/contract/private/arrow-val-first.rkt:555:3/home/skywalk/share/racket/collects/net/http-client.rkt:67:0: http-conn-open!/home/skywalk/share/racket/collects/net/http-client.rkt:274:0: http-conn-open/home/skywalk/share/racket/collects/racket/contract/private/arrow-val-first.rkt:555:3/home/skywalk/share/racket/collects/net/url.rkt:201:0: http://getpost-impure-port/home/skywalk/share/racket/collects/net/url.rkt:304:0: get-pure-port/headers/home/skywalk/share/racket/collects/racket/contract/private/arrow-val-first.rkt:555:3/home/skywalk/share/racket/collects/pkg/private/network.rkt:59:3/home/skywalk/share/racket/collects/pkg/private/catalog.rkt:218:0: read-from-server/home/skywalk/share/racket/collects/pkg/private/catalog.rkt:135:2: lookup-normally/home/skywalk/share/racket/collects/pkg/private/prefetch.rkt:129:4/home/skywalk/share/racket/collects/pkg/private/prefetch.rkt:128:2/home/skywalk/share/racket/collects/pkg/private/catalog.rkt:132:0: package-catalog-lookup/home/skywalk/share/racket/collects/pkg/private/catalog.rkt:200:0: package-catalog-lookup-source暂时就先到这里吧。