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COMP1070 Lecture #4

COMP1070 Lecture #4. Unix software architecture Correcting mistakes System setups Useful commands for the beginner Commands for study. The software architecture of the UNIX operating system. UNIX Kernel. Process management - creating, suspending, terminating and maintaining

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COMP1070 Lecture #4

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  1. COMP1070Lecture #4 Unix software architecture Correcting mistakes System setups Useful commands for the beginner Commands for study

  2. The software architecture of the UNIX operating system

  3. UNIX Kernel • Process management - creating, suspending, terminating and maintaining • Unix provides three primary IPC (interprocces communication) • Pipe ( resides in main memary), • Named pipe( named also as FIFO permanent communication canals resided on the disk), • BSD Socket ( communication canals in network or on Internet)

  4. Unix Shell • The UNIX shall is a program that start running when you log on and interprets the commands you enter. • UNIX shall prompt such as $ appear in a screen when you log in and command line follows the prompts. $ command [[-] option(s)] [option argts] [ command argt’s] Shell is case sensitive, space between command, command options, option argts and arguments Example (listing of current directory contents) $ ls $ ls –la $ ls –la f*

  5. Correcting Mistakes For each key combinations like <^D>- press and hald <Ctrl>key down while pressing second key (D) down < Back Space> or <^H> ( erase the previous character and move cursor to its position) <^U> - erase the entire current line and move cursor to the beginning of the line <^C> - terminate the current command and move to next line

  6. Some useful commands • passwd ( yppasswd or nipasswd) • man - man [ops][-s section] command list or - man –k keyword_list $ man –s2 read To get a short description of what any particular unix command does, you can use the whatis command. $ whatis man $ whatis login mkdir setenv The whereis command allows you to search along certain path to locate the utility programs and command such as shell programs

  7. List of command to study and practice Log into any UNIX machine and discover yourself the true meaning of following commands in detail. whoami set alias/unalias hosthame setenv write uname telenet mail echo passwd elm exit cp talk login lpr diff ls ssh more mv who cat cp cal uptime

  8. Editors Pico Emacs Vi Ed

  9. General keystroke commands and cursor movement commands ^F-Move forward a ch ^B_ Move backward a ch ^P- Move previous line ^N-Move the next line ^E- Move to the end of ^V- Move to next page ^Y- Move to prev page ^Shift 6 – Begin to mark a section for cutting ^C- reports coursers line and character # ^G - help ^J - justify the selected text ^K – cut out the selected text ^O- Saves, writes out the text ^R – Reads the text from file and pastes the current position of cursor ^T - Checks Spelling ^U – Pasts the current line of text ^V -Scroll page down on the Help page ^W - Whereis ( search for character strings) ^X – Exit ^Y Scroll one page up in the Help page

  10. HW #1 Write a short description of the following UNIX commands using man utility then send it to me. echo , mail, talk, ps, head, wc. Assigned 09/11/02 Due 09/14/02 by midnight PS. To submit you have to use the fallowing command % mail melikian < assignment.txt Where assignment.txt is the file with your hw .

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