toc.hdr

来自「美国mit操作系统课程所用的一个教学操作系统xv6」· HDR 代码 · 共 7 行

The numbers to the left of the file names in the table are sheet numbers.
The source code has been printed in a double column format with fifty
lines per column, giving one hundred lines per sheet (or page).
Thus there is a convenient relationship between line numbers and sheet numbers.