1.为脚本添加“--help”
#!/bin/sh
if [ ${#@} -ne 0 ] && [ "${@#"--help"}" = "" ]; then
printf -- '...help...\n';
exit 0;
fi;
2.输出字体添加颜色
https://misc.flogisoft.com/bash/tip_colors_and_formatting
3.旋转等待效果
http://mywiki.wooledge.org/BashFAQ/034
4.进度条
http://mywiki.wooledge.org/BashFAQ/044