Linux terminal 或许是Linux 上最频繁用到的工具之一。有个用的顺手的命令行，大大提高工作生活效率。
下面来看看：
1. 命令行提示符号
通过定义一组预先定义好的一组值，以及控制PS1 和PS2 环境变量来控制提示符号.
echo $PS1
通过修改直接生效。比如让命令行来显示命令的行号。
export PS1="\#" 来显示命令行号
可以通过man bash 开查看，搜key world： PS1
2. tab 补全
补全文集名，补全命令，补全环境变量都支持。 double press Tab key.
3. 命令行的中位置跳转和编辑
比如从当前位置（光标）返回到行头或者行尾，向前跳转一个单词或者向后，如果vim 里面的快捷键。
有很多功能支持，可以通过bind -p 来查看。 同时也可以修改到.bash.rc 文件中保存。
常用的： 获得上次运行的参数，比如C-1, M-.(也就是上一次运行命令的第一个参数）
M-. 缺省获得上次运行的最后一个参数。
M-#（ Alt-Shift-3) 可以将该命令给注释掉。
C-a / C-e 移动到行头或者行尾。
C-w 删掉之前一个单词。 当然这些都可以设置成适合自己的键。
还有命令行扩展 ： M-*'(insert-completions)
可以将 ls t* 扩展为 ls test.txt test.cpp.(假设当前目录有连个以test开头的我文件名）
'C-x*'(先按ctrl-x，然后按*) 也可以补全（glob-expand-word）
ls *.txt 将扩展为 ls test.txt log.txt (假设当前目录只有连个以txt为后缀的文件名）
"\C-g": abort
"\C-x\C-g": abort
"\e\C-g": abort
"\C-j": accept-line
"\C-m": accept-line
# alias-expand-line (not bound)
# arrow-key-prefix (not bound)
# backward-byte (not bound)
"\C-b": backward-char
"\eOD": backward-char
"\e[D": backward-char
"\C-h": backward-delete-char
"\C-?": backward-delete-char
"\C-x\C-?": backward-kill-line
"\e\C-h": backward-kill-word
"\e\C-?": backward-kill-word
"\eb": backward-word
"\e<": beginning-of-history
"\C-a": beginning-of-line
"\eOH": beginning-of-line
"\e[H": beginning-of-line
"\C-xe": call-last-kbd-macro
"\ec": capitalize-word
"\C-]": character-search
"\e\C-]": character-search-backward
"\C-l": clear-screen
"\C-i": complete
"\e\e": complete
"\e!": complete-command
"\e/": complete-filename
"\e@": complete-hostname
"\e{": complete-into-braces
"\e~": complete-username
"\e$": complete-variable
# copy-backward-word (not bound)
# copy-forward-word (not bound)
# copy-region-as-kill (not bound)
# dabbrev-expand (not bound)
"\C-d": delete-char
"\e[3~": delete-char
# delete-char-or-list (not bound)
"\e\\": delete-horizontal-space
"\e-": digit-argument
"\e0": digit-argument
"\e1": digit-argument
"\e2": digit-argument
"\e3": digit-argument
"\e4": digit-argument
"\e5": digit-argument
"\e6": digit-argument
"\e7": digit-argument
"\e8": digit-argument
"\e9": digit-argument
"\C-x\C-v": display-shell-version
"\C-xA": do-lowercase-version
"\C-xB": do-lowercase-version
"\C-xC": do-lowercase-version
"\C-xD": do-lowercase-version
"\C-xE": do-lowercase-version
"\C-xF": do-lowercase-version
"\C-xG": do-lowercase-version
"\C-xH": do-lowercase-version
"\C-xI": do-lowercase-version
"\C-xJ": do-lowercase-version
"\C-xK": do-lowercase-version
"\C-xL": do-lowercase-version
"\C-xM": do-lowercase-version
"\C-xN": do-lowercase-version
"\C-xO": do-lowercase-version
"\C-xP": do-lowercase-version
"\C-xQ": do-lowercase-version
"\C-xR": do-lowercase-version
"\C-xS": do-lowercase-version
"\C-xT": do-lowercase-version
"\C-xU": do-lowercase-version
"\C-xV": do-lowercase-version
"\C-xW": do-lowercase-version
"\C-xX": do-lowercase-version
"\C-xY": do-lowercase-version
"\C-xZ": do-lowercase-version
"\eA": do-lowercase-version
"\eB": do-lowercase-version
"\eC": do-lowercase-version
"\eD": do-lowercase-version
"\eE": do-lowercase-version
"\eF": do-lowercase-version
"\eG": do-lowercase-version
"\eH": do-lowercase-version
"\eI": do-lowercase-version
"\eJ": do-lowercase-version
"\eK": do-lowercase-version
"\eL": do-lowercase-version
"\eM": do-lowercase-version
"\eN": do-lowercase-version
"\eP": do-lowercase-version
"\eQ": do-lowercase-version
"\eR": do-lowercase-version
"\eS": do-lowercase-version
"\eT": do-lowercase-version
"\eU": do-lowercase-version
"\eV": do-lowercase-version
"\eW": do-lowercase-version
"\eX": do-lowercase-version
"\eY": do-lowercase-version
"\eZ": do-lowercase-version
"\el": downcase-word
# dump-functions (not bound)
# dump-macros (not bound)
# dump-variables (not bound)
"\e\C-i": dynamic-complete-history
"\C-x\C-e": edit-and-execute-command
# emacs-editing-mode (not bound)
"\C-x)": end-kbd-macro
"\e>": end-of-history
"\C-e": end-of-line
"\eOF": end-of-line
"\e[F": end-of-line
"\C-x\C-x": exchange-point-and-mark
# forward-backward-delete-char (not bound)
# forward-byte (not bound)
"\C-f": forward-char
"\eOC": forward-char
"\e[C": forward-char
"\C-s": forward-search-history
"\ef": forward-word
"\eg": glob-complete-word
"\C-x*": glob-expand-word
"\C-xg": glob-list-expansions
# history-and-alias-expand-line (not bound)
"\e^": history-expand-line
# history-search-backward (not bound)
# history-search-forward (not bound)
"\e#": insert-comment
"\e*": insert-completions
"\e.": insert-last-argument
"\e_": insert-last-argument
# kill-line (not bound)
"\C-k": kill-region
# kill-whole-line (not bound)
"\ed": kill-word
# magic-space (not bound)
# menu-complete (not bound)
# menu-complete-backward (not bound)
"\C-n": next-history
"\eOB": next-history
"\e[B": next-history
"\en": non-incremental-forward-search-history
# non-incremental-forward-search-history-again (not bound)
"\ep": non-incremental-reverse-search-history
# non-incremental-reverse-search-history-again (not bound)
# old-menu-complete (not bound)
"\C-o": operate-and-get-next
# overwrite-mode (not bound)
"\C-x!": possible-command-completions
"\e=": possible-completions
"\e?": possible-completions
"\C-x/": possible-filename-completions
"\C-x@": possible-hostname-completions
"\C-x~": possible-username-completions
"\C-x$": possible-variable-completions
"\C-p": previous-history
"\eOA": previous-history
"\e[A": previous-history
"\C-q": quoted-insert
"\C-v": quoted-insert
# redraw-current-line (not bound)
"\C-x\C-r": re-read-init-file
"\C-r": reverse-search-history
"\e\C-r": revert-line
"\er": revert-line
" ": self-insert
"!": self-insert
"\"": self-insert
"#": self-insert
"$": self-insert
"%": self-insert
"&": self-insert
"'": self-insert
"(": self-insert
")": self-insert
"*": self-insert
"+": self-insert
",": self-insert
"-": self-insert
".": self-insert
"/": self-insert
"0": self-insert
"1": self-insert
"2": self-insert
"3": self-insert
"4": self-insert
"5": self-insert
"6": self-insert
"7": self-insert
"8": self-insert
"9": self-insert
":": self-insert
";": self-insert
"<": self-insert
"=": self-insert
">": self-insert
"?": self-insert
"@": self-insert
"A": self-insert
"B": self-insert
"C": self-insert
"D": self-insert
"E": self-insert
"F": self-insert
"G": self-insert
"H": self-insert
"I": self-insert
"J": self-insert
"K": self-insert
"L": self-insert
"M": self-insert
"N": self-insert
"O": self-insert
"P": self-insert
"Q": self-insert
"R": self-insert
"S": self-insert
"T": self-insert
"U": self-insert
"V": self-insert
"W": self-insert
"X": self-insert
"Y": self-insert
"Z": self-insert
"[": self-insert
"\\": self-insert
"]": self-insert
"^": self-insert
"_": self-insert
"`": self-insert
"a": self-insert
"b": self-insert
"c": self-insert
"d": self-insert
"e": self-insert
"f": self-insert
"g": self-insert
"h": self-insert
"i": self-insert
"j": self-insert
"k": self-insert
"l": self-insert
"m": self-insert
"n": self-insert
"o": self-insert
"p": self-insert
"q": self-insert
"r": self-insert
"s": self-insert
"t": self-insert
"u": self-insert
"v": self-insert
"w": self-insert
"x": self-insert
"y": self-insert
"z": self-insert
"{": self-insert
"|": self-insert
"}": self-insert
"~": self-insert
"\200": self-insert
"\201": self-insert
"\202": self-insert
"\203": self-insert
"\204": self-insert
"\205": self-insert
"\206": self-insert
"\207": self-insert
"\210": self-insert
"\211": self-insert
"\212": self-insert
"\213": self-insert
"\214": self-insert
"\215": self-insert
"\216": self-insert
"\217": self-insert
"\220": self-insert
"\221": self-insert
"\222": self-insert
"\223": self-insert
"\224": self-insert
"\225": self-insert
"\226": self-insert
"\227": self-insert
"\230": self-insert
"\231": self-insert
"\232": self-insert
"\233": self-insert
"\234": self-insert
"\235": self-insert
"\236": self-insert
"\237": self-insert
" ": self-insert
"¡": self-insert
"¢": self-insert
"£": self-insert
"€": self-insert
"¥": self-insert
"Š": self-insert
"§": self-insert
"š": self-insert
"©": self-insert
"ª": self-insert
"«": self-insert
"¬": self-insert
"": self-insert
"®": self-insert
"¯": self-insert
"°": self-insert
"±": self-insert
"²": self-insert
"³": self-insert
"Ž": self-insert
"µ": self-insert
"¶": self-insert
"·": self-insert
"ž": self-insert
"¹": self-insert
"º": self-insert
"»": self-insert
"Œ": self-insert
"œ": self-insert
"Ÿ": self-insert
"¿": self-insert
"À": self-insert
"Á": self-insert
"Â": self-insert
"Ã": self-insert
"Ä": self-insert
"Å": self-insert
"Æ": self-insert
"Ç": self-insert
"È": self-insert
"É": self-insert
"Ê": self-insert
"Ë": self-insert
"Ì": self-insert
"Í": self-insert
"Î": self-insert
"Ï": self-insert
"Ð": self-insert
"Ñ": self-insert
"Ò": self-insert
"Ó": self-insert
"Ô": self-insert
"Õ": self-insert
"Ö": self-insert
"×": self-insert
"Ø": self-insert
"Ù": self-insert
"Ú": self-insert
"Û": self-insert
"Ü": self-insert
"Ý": self-insert
"Þ": self-insert
"ß": self-insert
"à": self-insert
"á": self-insert
"â": self-insert
"ã": self-insert
"ä": self-insert
"å": self-insert
"æ": self-insert
"ç": self-insert
"è": self-insert
"é": self-insert
"ê": self-insert
"ë": self-insert
"ì": self-insert
"í": self-insert
"î": self-insert
"ï": self-insert
"ð": self-insert
"ñ": self-insert
"ò": self-insert
"ó": self-insert
"ô": self-insert
"õ": self-insert
"ö": self-insert
"÷": self-insert
"ø": self-insert
"ù": self-insert
"ú": self-insert
"û": self-insert
"ü": self-insert
"ý": self-insert
"þ": self-insert
"ÿ": self-insert
"\C-@": set-mark
"\e ": set-mark
# shell-backward-kill-word (not bound)
# shell-backward-word (not bound)
"\e\C-e": shell-expand-line
# shell-forward-word (not bound)
# shell-kill-word (not bound)
# skip-csi-sequence (not bound)
"\C-x(": start-kbd-macro
# tab-insert (not bound)
"\e&": tilde-expand
"\C-t": transpose-chars
"\et": transpose-words
# tty-status (not bound)
"\C-x\C-u": undo
"\C-_": undo
# universal-argument (not bound)
# unix-filename-rubout (not bound)
"\C-u": unix-line-discard
"\C-w": unix-word-rubout
"\eu": upcase-word
# vi-append-eol (not bound)
# vi-append-mode (not bound)
# vi-arg-digit (not bound)
# vi-back-to-indent (not bound)
# vi-bword (not bound)
# vi-bWord (not bound)
# vi-change-case (not bound)
# vi-change-char (not bound)
# vi-change-to (not bound)
# vi-char-search (not bound)
# vi-column (not bound)
# vi-complete (not bound)
# vi-delete (not bound)
# vi-delete-to (not bound)
# vi-editing-mode (not bound)
# vi-end-word (not bound)
# vi-eof-maybe (not bound)
# vi-eword (not bound)
# vi-eWord (not bound)
# vi-fetch-history (not bound)
# vi-first-print (not bound)
# vi-fword (not bound)
# vi-fWord (not bound)
# vi-goto-mark (not bound)
# vi-insert-beg (not bound)
# vi-insertion-mode (not bound)
# vi-match (not bound)
# vi-movement-mode (not bound)
# vi-next-word (not bound)
# vi-overstrike (not bound)
# vi-overstrike-delete (not bound)
# vi-prev-word (not bound)
# vi-put (not bound)
# vi-redo (not bound)
# vi-replace (not bound)
# vi-rubout (not bound)
# vi-search (not bound)
# vi-search-again (not bound)
# vi-set-mark (not bound)
# vi-subst (not bound)
# vi-tilde-expand (not bound)
# vi-yank-arg (not bound)
# vi-yank-to (not bound)
"\C-y": yank
"\e.": yank-last-arg
"\e_": yank-last-arg
"\e\C-y": yank-nth-arg
"\ey": yank-pop
4. alias
别名，对于经常用到的自定义命令可以用shellout方式封装一下，或者最简单的就是别名。
5. 配置文件
上面这些都个放到配置文件里，避免一次有一次的修改. 放在.bashrc 中，同时在.profile 文件里面调用bashrc.
进一步可以把这个文件放到云上面去，通过One Ubuntu 来同步不同计算机之间被的配置文件。 这样所有的机器，即使从新装机，也不用怕配额之文件丢失，也不用再去修改。
强烈建议做这么一次，公欲利其事必先利其器：）
reference:
http://www.kerneltravel.net/newbie/bash_readline.htm
