[doc] add CLI doc (#18871)

Signed-off-by: reidliu41 <reid201711@gmail.com>
Co-authored-by: reidliu41 <reid201711@gmail.com>

docs/.nav.yml

@@ -12,6 +12,7 @@ nav:
       - User Guide: usage/README.md
       - Developer Guide: contributing/README.md
       - API Reference: api/README.md
+      - CLI Reference: cli/README.md
     - Timeline:
       - Roadmap: https://roadmap.vllm.ai
       - Releases: https://github.com/vllm-project/vllm/releases
@@ -56,6 +57,8 @@ nav:
     - Contents:
       - glob: api/vllm/*
         preserve_directory_names: true
+  - CLI Reference:
+    - Summary: cli/README.md
   - Community:
     - community/*
     - Blog: https://blog.vllm.ai

docs/cli/README.md

+# vLLM CLI Guide
+
+The vllm command-line tool is used to run and manage vLLM models. You can start by viewing the help message with:
+
+```
+vllm --help
+```
+
+Available Commands:
+
+```
+vllm {chat,complete,serve,bench,collect-env,run-batch}
+```
+
+## Table of Contents
+
+- [serve](#serve)
+- [chat](#chat)
+- [complete](#complete)
+- [bench](#bench)
+  - [latency](#latency)
+  - [serve](#serve-1)
+  - [throughput](#throughput)
+- [collect-env](#collect-env)
+- [run-batch](#run-batch)
+- [More Help](#more-help)
+
+## serve
+
+Start the vLLM OpenAI Compatible API server.
+
+Examples:
+
+```bash
+# Start with a model
+vllm serve meta-llama/Llama-2-7b-hf
+
+# Specify the port
+vllm serve meta-llama/Llama-2-7b-hf --port 8100
+
+# Check with --help for more options
+# To list all groups
+vllm serve --help=listgroup
+
+# To view a argument group
+vllm serve --help=ModelConfig
+
+# To view a single argument
+vllm serve --help=max-num-seqs
+
+# To search by keyword
+vllm serve --help=max
+```
+
+## chat
+
+Generate chat completions via the running API server.
+
+Examples:
+
+```bash
+# Directly connect to localhost API without arguments
+vllm chat
+
+# Specify API url
+vllm chat --url http://{vllm-serve-host}:{vllm-serve-port}/v1
+
+# Quick chat with a single prompt
+vllm chat --quick "hi"
+```
+
+## complete
+
+Generate text completions based on the given prompt via the running API server.
+
+Examples:
+
+```bash
+# Directly connect to localhost API without arguments
+vllm complete
+
+# Specify API url
+vllm complete --url http://{vllm-serve-host}:{vllm-serve-port}/v1
+
+# Quick complete with a single prompt
+vllm complete --quick "The future of AI is"
+```
+
+## bench
+
+Run benchmark tests for latency online serving throughput and offline inference throughput.
+
+Available Commands:
+
+```bash
+vllm bench {latency, serve, throughput}
+```
+
+### latency
+
+Benchmark the latency of a single batch of requests.
+
+Example:
+
+```bash
+vllm bench latency \
+    --model meta-llama/Llama-3.2-1B-Instruct \
+    --input-len 32 \
+    --output-len 1 \
+    --enforce-eager \
+    --load-format dummy
+```
+
+### serve
+
+Benchmark the online serving throughput.
+
+Example:
+
+```bash
+vllm bench serve \
+    --model meta-llama/Llama-3.2-1B-Instruct \
+    --host server-host \
+    --port server-port \
+    --random-input-len 32 \
+    --random-output-len 4  \
+    --num-prompts  5
+```
+
+### throughput
+
+Benchmark offline inference throughput.
+
+Example:
+
+```bash
+vllm bench throughput \
+    --model meta-llama/Llama-3.2-1B-Instruct \
+    --input-len 32 \
+    --output-len 1 \
+    --enforce-eager \
+    --load-format dummy
+```
+
+## collect-env
+
+Start collecting environment information.
+
+```bash
+vllm collect-env
+```
+
+## run-batch
+
+Run batch prompts and write results to file.
+
+Examples:
+
+```bash
+# Running with a local file
+vllm run-batch \
+    -i offline_inference/openai_batch/openai_example_batch.jsonl \
+    -o results.jsonl \
+    --model meta-llama/Meta-Llama-3-8B-Instruct
+
+# Using remote file
+vllm run-batch \
+    -i https://raw.githubusercontent.com/vllm-project/vllm/main/examples/offline_inference/openai_batch/openai_example_batch.jsonl \
+    -o results.jsonl \
+    --model meta-llama/Meta-Llama-3-8B-Instruct
+```
+
+## More Help
+
+For detailed options of any subcommand, use:
+
+```bash
+vllm <subcommand> --help
+```