Claude Code

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Installation on Ubuntu (WSL2)

sudo apt install npm

mkdir -p ~/.npm-global
npm config set prefix ~/.npm-global
echo 'export PATH=~/.npm-global/bin:$PATH' >> ~/.bashrc
source ~/.bashrc

npm install -g @anthropic-ai/claude-code

which claude
claude doctor
claude --version

Memory

• https://docs.anthropic.com/en/docs/claude-code/memory

	file
Project memory	./CLAUDE.md
User memory	~/.claude/CLAUDE.md
Local project memory	./CLAUDE.local.md deprecated

Sub agents

	file
User sub agents	~/.claude/agents/
Project sub agents	.claude/agents/

• Example sub agents:
  • https://github.com/wshobson/agents

Custom commands

	file
User commands	~/.claude/commands/
Project commands	.claude/commands/

MCP Server

claude mcp list
claude mcp add <name> <command> [args...]
  -s local     (default, only this project)
  -s project   (.mcp.json)
  -s user      (all my projects)
claude mcp get my-server
claude mcp remove my-server

settings.json

• https://docs.anthropic.com/en/docs/claude-code/settings

	file	scope
User settings	~/.claude/settings.json
Project settings	.claude/settings.json	all users
Project settings	.claude/settings.local.json	local/personal only

Example:

{
  "permissions": {
    "allow": [
      "Bash(ls:*)"
    ],
    "deny": []
  }
}

Hook example:

  "hooks": {
    "UserPromptSubmit": [
      {
        "hooks": [
          {
            "type": "command",
            "command": ".claude/hooks/prompt-validator.py"
          }
        ]
      }
    ]
  }

Command line options

claude                                   # interactive mode
claude "task"                            # run single task
claude -p "task"                         # run single task, print response, exit
claude --dangerously-skip-permissions

claude config list
claude doctor
claude update

Learning Videos

	Description	Channel	URL
1.	Basics	Matt Maher	https://www.youtube.com/watch?v=T_IYHx-9VGU
2.	Best practices	Matt Maher	https://www.youtube.com/watch?v=IUi--nVU4yA
H	Hooks	IndyDevDan	https://www.youtube.com/watch?v=J5B9UGTuNoM
H	Hooks 2	IndyDevDan	https://www.youtube.com/watch?v=9ijnN985O_c
		IndyDevDan	https://github.com/disler/claude-code-hooks-mastery
S	Sub agents	Matt Maher	https://www.youtube.com/watch?v=6MLyc3jYisQ
S	Sub agents	IndyDevDan	https://www.youtube.com/watch?v=7B2HJr0Y68g

• Channels
  • Matt Maher: https://www.youtube.com/@MetalSole
  • IndyDevDan: https://www.youtube.com/@indydevdan/