これは、なにをしたくて書いたもの？
Claude Codeの推奨方法がネイティブインストールになったということなので。
Quickstart / Step 1: Install Claude Code
ちょっとどういうものか見てみたくなりまして。
動作というよりは、バイナリーの話です。バイナリーの。
環境
今回の環境はこちら。
$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 24.04.3 LTS Release: 24.04 Codename: noble $ uname -srvmpio Linux 6.8.0-87-generic #88-Ubuntu SMP PREEMPT_DYNAMIC Sat Oct 11 09:28:41 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
ネイティブ版のClaude Codeをインストールする
Claude Codeのネイティブ版のインストール方法は、よくあるcurl＋bashを使ったものです。
Quickstart / Step 1: Install Claude Code
つまり、こちら。
$ curl -fsSL https://claude.ai/install.sh | bash
~/.local/bin/claudeにインストールされたと言われます。
Setting up Claude Code... ✔ Claude Code successfully installed! Version: 2.0.31 Location: ~/.local/bin/claude Next: Run claude --help to get started ⚠ Setup notes: • Native installation exists but ~/.local/bin is not in your PATH. Run: echo 'export PATH="$HOME/.local/bin:$PATH"' >> your shell config file && source your shell config file ✅ Installation complete!
また~/.local/binにPATHが通っていないと警告されるようですが、XDG Base Directory Specificationに従っているディストリビューションであれば
新しくシェルを起動すれば反映されるでしょう。
$HOME/.local/binってなんだ？（XDG Base Directory Specification） - CLOVER🍀
インストール先の確認。
$ which claude $HOME/.local/bin/claude
バージョン。
$ claude --version 2.0.31 (Claude Code)
ヘルプ。
$ claude --help
Usage: claude [options] [command] [prompt]
Claude Code - starts an interactive session by default, use -p/--print for non-interactive output
Arguments:
prompt Your prompt
Options:
-d, --debug [filter] Enable debug mode with optional category filtering (e.g., "api,hooks" or "!statsig,!file")
--verbose Override verbose mode setting from config
-p, --print Print response and exit (useful for pipes). Note: The workspace trust dialog is skipped when Claude is run with the -p
mode. Only use this flag in directories you trust.
--output-format <format> Output format (only works with --print): "text" (default), "json" (single result), or "stream-json" (realtime streaming)
(choices: "text", "json", "stream-json")
--include-partial-messages Include partial message chunks as they arrive (only works with --print and --output-format=stream-json)
--input-format <format> Input format (only works with --print): "text" (default), or "stream-json" (realtime streaming input) (choices: "text",
"stream-json")
--mcp-debug [DEPRECATED. Use --debug instead] Enable MCP debug mode (shows MCP server errors)
--dangerously-skip-permissions Bypass all permission checks. Recommended only for sandboxes with no internet access.
--allow-dangerously-skip-permissions Enable bypassing all permission checks as an option, without it being enabled by default. Recommended only for sandboxes
with no internet access.
--replay-user-messages Re-emit user messages from stdin back on stdout for acknowledgment (only works with --input-format=stream-json and
--output-format=stream-json)
--allowedTools, --allowed-tools <tools...> Comma or space-separated list of tool names to allow (e.g. "Bash(git:*) Edit")
--tools <tools...> Specify the list of available tools from the built-in set. Use "" to disable all tools, "default" to use all tools, or
specify tool names (e.g. "Bash,Edit,Read"). Only works with --print mode.
--disallowedTools, --disallowed-tools <tools...> Comma or space-separated list of tool names to deny (e.g. "Bash(git:*) Edit")
--mcp-config <configs...> Load MCP servers from JSON files or strings (space-separated)
--system-prompt <prompt> System prompt to use for the session
--append-system-prompt <prompt> Append a system prompt to the default system prompt
--permission-mode <mode> Permission mode to use for the session (choices: "acceptEdits", "bypassPermissions", "default", "plan")
-c, --continue Continue the most recent conversation
-r, --resume [sessionId] Resume a conversation - provide a session ID or interactively select a conversation to resume
--fork-session When resuming, create a new session ID instead of reusing the original (use with --resume or --continue)
--model <model> Model for the current session. Provide an alias for the latest model (e.g. 'sonnet' or 'opus') or a model's full name
(e.g. 'claude-sonnet-4-5-20250929').
--fallback-model <model> Enable automatic fallback to specified model when default model is overloaded (only works with --print)
--settings <file-or-json> Path to a settings JSON file or a JSON string to load additional settings from
--add-dir <directories...> Additional directories to allow tool access to
--ide Automatically connect to IDE on startup if exactly one valid IDE is available
--strict-mcp-config Only use MCP servers from --mcp-config, ignoring all other MCP configurations
--session-id <uuid> Use a specific session ID for the conversation (must be a valid UUID)
--agents <json> JSON object defining custom agents (e.g. '{"reviewer": {"description": "Reviews code", "prompt": "You are a code
reviewer"}}')
--setting-sources <sources> Comma-separated list of setting sources to load (user, project, local).
--plugin-dir <paths...> Load plugins from directories for this session only (repeatable)
-v, --version Output the version number
-h, --help Display help for command
Commands:
mcp Configure and manage MCP servers
plugin Manage Claude Code plugins
migrate-installer Migrate from global npm installation to local installation
setup-token Set up a long-lived authentication token (requires Claude subscription)
doctor Check the health of your Claude Code auto-updater
update Check for updates and install if available
install [options] [target] Install Claude Code native build. Use [target] to specify version (stable, latest, or specific version)
アップデートはclaude updateのようですね。
$ claude update Current version: 2.0.31 Checking for updates... Claude Code is up to date (2.0.31)
これでもいいんでしょうか。
$ claude install latest ✔ Claude Code successfully installed! Version: 2.0.31 Location: ~/.local/bin/claude Next: Run claude --help to get started
インストールされたバイナリーをfileコマンドで見てみると、シンボリックリンクのようです。
$ file $(which claude) /home/user/.local/bin/claude: symbolic link to /home/file/.local/share/user/versions/2.0.31
シンボリックリンク先をfileコマンドで見てると、実行可能バイナリーになっていますね。
$ file /user/user/.local/share/claude/versions/2.0.31 /home/user/.local/share/claude/versions/2.0.31: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0, BuildID[sha1]=668a1c029f30aa64ce77170cdab8fc16233395b1, not stripped
113Mあります。
$ ll -h /home/user/.local/share/claude/versions/2.0.31 -rwxr-xr-x 1 user user 113M 11月 2 21:54 /home/user/.local/share/claude/versions/2.0.31*
lddで見てみます。
$ ldd /home/user/.local/share/claude/versions/2.0.31
linux-vdso.so.1 (0x00007fff26dbc000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f9a41400000)
/lib64/ld-linux-x86-64.so.2 (0x00007f9a416c6000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f9a416b9000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f9a416b4000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f9a41317000)
readelfで見てみると、Rustも使われていそうな感じもしますが
$ readelf -p .comment /home/user/.local/share/claude/versions/2.0.31 セクション '.comment' の文字列ダンプ: [ 0] Linker: Ubuntu LLD 19.1.7 [ 1a] GCC: (Ubuntu 13.1.0-8ubuntu1~20.04.2) 13.1.0 [ 47] Ubuntu clang version 19.1.7 (++20250114103238+cd708029e0b2-1~exp1~20250114103342.77) [ 9c] rustc version 1.92.0-nightly (7ac0330c6 2025-09-25)
C、C++で実装されたアプリケーションかなと思います。
$ nm -C /home/user/.local/share/claude/versions/2.0.31 | grep main
U __libc_start_main
U bind_textdomain_codeset
他にはこのあたりやV8がいるのも見えたり。
npmパッケージの場合は？
一応、npmパッケージ版も見ておきましょう。
$ npm i @anthropic-ai/claude-code
$ file node_modules/.bin/claude node_modules/.bin/claude: symbolic link to ../@anthropic-ai/claude-code/cli.js
こちらはしっかりJavaScriptですね。
$ file node_modules/@anthropic-ai/claude-code/cli.js node_modules/@anthropic-ai/claude-code/cli.js: Node.js script executable, ASCII text, with very long lines (40849)
