my notes of bash

时间：2006-11-08 来源：wonder3

note some fundamental concept down here from some books,and some of my comments and experiments.
1.basic files:
     tilde ~ expansion
     the wildchar: ?,*,[set],[!set]
     the brace{} expansion
input and output:
    /dev/stdin guess what it is^_^
   and it's my test:
enter "ls /dev/|grep std"
lrwxrwxrwx 1 root root          15 2006-11-09 05:42 stderr -> /proc/self/fd/2
lrwxrwxrwx 1 root root          15 2006-11-09 05:42 stdin -> /proc/self/fd/0
lrwxrwxrwx 1 root root          15 2006-11-09 05:42 stdout -> /proc/self/fd/1

so,we can see the the string we type from keyboard is stored in the buffer /proc/self/fd/0(it's just my guess),and similar to the other two.

file redirection: '<' for in(useful for the command that don't accept filename agument) and the '>' for out
the pipe:|
if you want to run a job background and don't want to it produce stdout,just redirect the output.
some special char:
'," :quote,and both can quote "return".
\ :......

echo 'Herry'\''s tea party'
guess what's the output?
Herry's tea party

you may conclude something from the above

stty -a to see the combintion key(mainly Ctrl+...)mean.
don't forget the command "help",it's helpful indeed sometimes.

2.Command-Line Editing
set the editing mode:
    set -o vi|emacs
mostly we are working in the emacs editing mode.

basic emacs-mode commands:
C-b,C-f to move back or fore
C-h,C-d to delete backw or forew

E-b,E-f to move backward of foreward a word
E-C-h,E-Del to delete a word foreward,
E-Del seems to have some problem.
E-d ... backward

C-y   insert what just be deleted
C-A   Move to beginning of line
C-E   Move to end of line
C-K   Kill forward to end of line

edit about the history file:
C-p
C-n
C-r search reverse
E-< first...
E-> last...

you possiblely kown tab completion
and there's more about other completion command
E-?   :list possible choice
E-Tab :attempt completion from the history list
the following,prefixed by
'E-*'     for attempt completion,and
'C-x,*'   for list possible ..
/ : filename
~ : username
$ : varible
@ : hostname
! : command

and other combination key:
C-j|m|o :ok,when j,linefeed;m,cr;o,lf?cr?and when o,it display next line in command history.
C-l :like the command"clear"
C-t :change position of chars
C-u :kill line
C-v :quoted insert(atually i dont kown how to use it)
C-[ :Same as ESC(so....)
E-c :change the char to capital
E-u :change the all chars afterpoint to capital
E-l :the opposite
E-.|_ :insert last word in previois command

the vi-mode?no...

the fc commmand:
fc is a built-in shell command,and see man ,info,help....

Event Designators:
!,!!,!n,!-n,!string,!?string? :.....
^string1^string2 :last command wite string2 replacing.
history: to see the history command

Word Designators:(seems to follow Event Designators)
0~n :nth word
^,$ :first or last agument
%   :a word mostly search.
x-y :from x to y
*   :in fact ,1-$
x* :x to $
x- :x to $-1

Modifiers:
h,r,e,t
:remove pathname but head/suffix/all but suffix/pathname but tail
p:print the resulting command but doesn't execute it
q:quote.. ?
x:quote.. ?
s/old/new :substitutes new for old

readline:
what's it?
setupfile: .inputrc(determined by the varible INPUTRC)
             its usage is bind keyname(ro so-call escape sequence) to macro or readline function
escape sequence:
     \C- :control key prefix
\M- :Meta
\e :escape char
\\ :\
\<''> :double quote char
\'    :single quote

to be contined...