cal.6

UNIX v6源代码 这几乎是最经典的unix版本 unix操作系统设计和莱昂氏unix源代码分析都是用的该版

.th CAL VI 11/1/73
.sh NAME
cal \*- print calendar
.sh SYNOPSIS
.bd cal
[ month ] year
.sh DESCRIPTION
.it Cal
prints a calendar for the specified year.
If a month is also specified, a calendar
just for that month is printed.
.it Year
can be between 1
and 9999.
The
.it month
is a number between 1 and 12.
The calendar
produced is that for England and her colonies.
.s3
Try September 1752.
.sh BUGS
The year is always considered to start in January even though this
is historically naive.