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Os1 -

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Os1 Os1

/

: ! ,

// shell

process = task - file - I/O ( I/O , )directory () - - , system call PID - process identifierfork - system call (UNIX)clone (LINUX)

system functions - - system call - " " - -

- - ()

.= - , , ( , ); - ; - (preempt); preempt - = ! -

- - 1 (). ( );

, , : TC eBid -

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UNIX, LINUX ( ! - ! )

- - , -1968 . - The System - ; , ( ! )

- - ; (MINIX, Mach)

UNIX

//

tty - ""( ); +

2. .

Shell - !:JCL (Job Control Language) - OS IBM / 360Bourne Shell (sh) - Unix version 7C shell (csh) - BSDKorn Shell (ksh) - Unix System VBourne again shell (bash) - LinuxCOMMAND.COM - Ms-DOS

JCL - " "( ) - , ; - " ", .. " " , !sh - csh - BSD- Unix ( ???); csh, ksh sh( ! )bash - sh, ksh

- = , = = = - shell script, shell file, , .= , = - ; shell ; ;

- = = - shell= - shell= = = = (copy, del)= ()

-

shell

while ( ){

Os1 -

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(prompt); ; ;}

shell login shell- .

= init - @start (, autoexec.bat), () -, = - ( ) user-sys login do logout ( )= (prompt) ;bash - ; user- bash.$, admin - bash#;prompt ; prompt - "$", "#" prompt">"- prompt- , prompt ( )

- 1 { ; ;if ( )_();else{ ;if ( ) - shell ;else{ ;if ( ) wait();}}}

: MS-DOS format- "format".com, .bat, .exe ; Linux: CP-, "CP"

- - - / (background mode) - ; "" , , - wait() - system call,

- 2 diff : if ( - ) -subshell, ;else exec;if (! )wait()

1

II - -

- I : shell

Os1 -

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page revision: 20, last edited: 8 May 2009, 16:54 GMT+02 (1093 days ago)

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