SHELL

ShellBourne ShellJob ShellBash ShellC Shell

Bash Shell

Bash Shell/etc/profile/etc/profile.d/etc/bashrcBash Shell ~/.bashrc~/.bash_profile

Bash Shell/etc/bashrc

typeechoenvsetaliashistorycutgrep

1 Shell Shell , , , shell , , , shell ,

Shell

Shell shell, MS DOS shell command.comWindows shell explorer.exeUnix , shell shell Small Bourne Shell (ash)Bourne Again Shell (bash/bash2)Bourne Shell (bsh)BSD C Shell (csh)Korn Shell (ksh)Enhanced C Shell (tcsh) ZShell (zsh)

ShellBourne Shell shell, Unix BSD C Shell Berkeley , Enhanced C Shell , Bourne Again Shell Bourne Shell, BSD C Shell , (alias) (history)

Shell shell , shell , Linux shell bash, ash kshtcsh zsh

Shell Unix shell , BSD csh, Linux bash shell shell , shell

Shell , $%# > cassia

shell , (, )ksh$ bash bash2[cassia@free ~]$zsh[cassia@free]~ % tcsh[cassia@free ~]$, ,

Shell shell # cat /etc/shells

Shell shell, echo , SHELL

Shell , finger , shell

Shell shell , shell shell shell, exit

Shell

Shell, , shell, ( cassia )

Shellchsh ,

, shell

FTP E-mail , telnet ssh shell /sbin/nologin , ( cas sia ) telnet root /etc/passwd

2 Shell shell , Linux bash, bash

, [][][][][Backspace]

, , .bash_history ,

history , ,

, ""

! !-0 ,

, mycopy , cp mycopy cp alias , , Linux

, alias ,

, , unalias

, , , alias .bashrc

.bashrc , alias , .bashrc , /etc/profile.d *.sh

, .bashrc , /etc/profile.d *.sh , .bashrc ,

,

, bash , , [Tab] , bash ,

, ,

, bgfgjobs

, , root ,

,

3 Shell Shell , #, tac /etc/bashrc

3 Shell &updatedb & , ', shell mycopy='cp -v' , mycopy cp -v * ls a* , "a"

3 Shell ? ls b? , 2 , 1 "b", 2 . ./exefile , exefile (exefile ).. cd ..

3 Shell ;,

>,

3 Shell >>

\ (escape), |, ~,

3 Shell []

3 Shell [!], ls [!abc]* , "a" "b""c" {}: [] , , ls {a,b,c}*

. * /tmp , ls .*, .* shell . .. ls .. , cp -R /root/.* /tmp/ , /root , cp -R /root/../* /tmp/, , . *

4 Shell Shell , (Environment Variables) shell ,

shell , bash set (tcsh setenv )

Bourne Shell ,

export

, , , , .bashrc

.bashrc , , root /etc bashrc profile , /etc/profile.d .sh

, , ,

PATH , PATH ,

PATH

, , , .bashrc ,

bash [Tab] [Tab] [Tab] [Ctrl]+c [Ctrl]+d [Shift]-[Pageup]/[Shift]-[Pagedown]/

bash == \ ` command`$(command) export export PATHunset