brew install lox/tap/slack-cli

slack-cli view <url>          # View any Slack URL (message, thread, or channel)
slack-cli search <query>      # Search messages
slack-cli channel list        # List channels you're a member of
slack-cli channel read        # Read recent messages from a channel
slack-cli channel info        # Show channel information
slack-cli thread read         # Read a thread by URL or channel+timestamp
slack-cli user list           # List users in the workspace
slack-cli user info           # Show user information
slack-cli auth config         # Configure Slack app credentials
slack-cli auth login          # Authenticate with Slack via OAuth
slack-cli auth status         # Show authentication status

slack-cli view "https://workspace.slack.com/archives/C123/p1234567890" --markdown

slack-cli search "from:@username keyword"
slack-cli search "in:#channel-name keyword"

slack-cli channel read #general --limit 50

slack-cli --help
slack-cli view --help
slack-cli search --help