有了man bc，我有一条以开头的行bc(1)。
bc(1) bc(1)
NAME
bc - An arbitrary precision calculator language
某些Unix书还描述了带有（1）的Unix命令，就像这个SO问题一样-https: //stackoverflow.com/questions/8402181/how-do-i-get-bc1-to-print-the-leading-零。这是什么意思？
这是手册的章节号。
来自man man：
The table below shows the section numbers of the manual followed by the types of pages they contain.
1 Executable programs or shell commands
2 System calls (functions provided by the kernel)
3 Library calls (functions within program libraries)
4 Special files (usually found in /dev)
5 File formats and conventions eg /etc/passwd
6 Games
7 Miscellaneous (including macro packages and conventions), e.g. man(7), groff(7)
8 System administration commands (usually only for root)
9 Kernel routines [Non standard]
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我来说两句