Executable programs or shell commands——普通的命令
System calls (functions provided by the kernel)——系統(tǒng)調(diào)用
Library calls (functions within program libraries)——庫函數(shù)
Special files (usually found in /dev)——特殊文件
File formats and conventions eg /etc/passwd——文件格式
Games——游戲
這些參數(shù)被看做沒有dontdelete特性, 問題主要是我們可以detele它們. 實際上safari 2.x存在更多的問題（刪除沒有引用的變量e.g delete 1）會拋異常, function的聲明會創(chuàng)建可刪除屬性(不包括變量聲名), 變量聲明在eval中變?yōu)椴豢蓜h除（除了function聲明）.。2 the following precautionary information, or itsequivalent (as a minimum), shall be prominently dis-played in legible print on all packages of filler metal,including individual unit packages enclosed within alarger package。- choose this option only if you have another ubuntu os (e.g. ubuntu 10.10) and you want to upgrade it to ubuntu 11.04. your personal files will be saved, but you will have to reinstall most of your packages. the general system settings will be erased。
System administration commands (usually only for root)——系統(tǒng)管理用的命令
Kernel routines [Non standard]——內(nèi)核
我們再看一下man –help的結(jié)果：
man [-adfhktwW] [section] [-M path] [-P pager] [-S list]
[-m system] [-p string] name ...
a : find all matching entries
c : do not use cat file
d : print gobs of debugging information
D : as for -d, but also display the pages
f : same as whatis(1)
h : print this help message
k : same as apropos(1)
K : search for a string in all pages
t : use troff to format pages for printing
w : print location of man page(s) that would be displayed
(if no name given: print directories that would be searched)
W : as for -w, but display filenames only
C file : use `file' as configuration file
M path : set search path for manual pages to `path'
P pager : use program `pager' to display pages
S list : colon separated section list
m system : search for alternate system's man pages
p string : string tells which preprocessors to run
e - [n]eqn(1) p - pic(1) t - tbl(1)
g - grap(1) r - refer(1) v - vgrind(1)man后面可以跟-acdDfhkKtwW這些（至于為什么方括號內(nèi)與下面的列表不一致，這個我也沒有搞懂），跟-C是加文件，加-M是設(shè)置man查詢文件所在地址，加-P是顯示手冊的第幾頁，加-S用冒號隔開部分列表，加-m查詢可替換的系統(tǒng)手冊頁，加-p用字符串操作預(yù)處理器
假設(shè)最簡單的
man read來查看read這個命令，會看到類似vi編輯器的界面。當(dāng)然啦，它的快捷命令與vi基本類似。不同之處在于vi可以進(jìn)入插入模式進(jìn)行文本改寫，而這里不可以linux命令大全，即少了那些用來編輯的命令。
個人感覺用到最多的幾個快捷命令是：
f（或鍵盤上“PgDn”）——向后翻頁
b（或鍵盤上“PgUp”）——向前翻頁
d——向后翻半頁
u——向前翻半頁
g——跳到文章開頭
G——跳到文章結(jié)尾
退出的操作仍舊是q（quit退出）。
不得不說用了man之后比help舒服了許多。
最后，推薦兩個在線查詢手冊命令的網(wǎng)站：
man.he.net
linux.die.net/man/
