[root@mvp ~]# axel -h
Usage: axel [options] url1 [url2] [url...]
--max-speed=x -s x Specify maximum speed (bytes per second) //速度限制
--num-connections=x -n x Specify maximum number of connections //连接数
--output=f -o f Specify local output file
--search[=x] -S [x] Search for mirrors and download from x servers
--header=x -H x Add header string
--user-agent=x -U x Set user agent
--no-proxy -N Just don't use any proxy server
--quiet -q Leave stdout alone
--verbose -v More status information
--alternate -a Alternate progress indicator //进度条(交替显示)
--help -h This information
--version -V Version information