介绍主页（上面有多种安装该工具的方法）：https://github.com/tldr-pages/tldr
这里只演示使用pip的安装方法，
pip install tldr
查询lsof命令的使用方法：
Mac-Pro:~ K$ tldr lsof
# lsof
Lists open files and the corresponding processes.
Note: Root privileges (or sudo) is required to list files opened by others.
- Find the processes that have a given file open:
lsof path/to/file
- Find the process that opened a local internet port:
lsof -i :port
- Only output the process ID (PID):
lsof -t path/to/file
- List files opened by the given user:
lsof -u username
- List files opened by the given command or process:
lsof -c process_or_command_name
- List files opened by a specific process, given its PID:
lsof -p PID
- List open files in a directory:
lsof +D path/to/directory
总体来说比起man命令查询的结果要简洁多，每个使用方法都有解释。
