常见问题解答

创建指定大小，不占磁盘空间的文件

$ dd if=/dev/null of=/path/to/file [bs=1024] count=0 seek=20000000

镜像网站

$ wget --mirror --convert-links --adjust-extension --page-requisites --no-parent https://www.example.com

获取图片详细信息

$ identify -verbose example.jpg

M3U8 Download

$ ffmpeg -i https://example.com/index.m3u8 -c copy out.flv

Mac 允许任何来源

$ sudo spctl --master-disable

计算机常见术语及缩写

Abbreviations

What does el5, el6, and el7 mean?

EL is short for Red Hat Enterprise Linux (EL).

• EL5 is the download for Red Hat 5.x, CentOS 5.x, CloudLinux 5.x.
• EL6 is the download for Red Hat 6.x, CentOS 6.x, and CloudLinux 6.x.
• EL7 is the download for Red Hat 7.x, CentOS 7.x, and CloudLinux 7.x.

The .netrc file

netrc, .netrc - user configuration for ftp