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Cmsc 312 Operating Systems
UNIX? DOS – PC? VAX/VMS - mainframe Unix – PC, workstation, mainframe 1970 bell Lab For computer scientist? Why popular? Free to academia Portable – C
System V Berkeley BSD Solaris Linux Xenix,Aix
Kernel & shell File management memory management Process scheduling Communication management Shell – interactive interface C shell Bourne shell Graphic interface- GUI
Text processing Editor Vi Others Formatter LaTeX or TeX
Login – logout (shell) Login: accntname Password: ******* %prompt or machine name> Logout : logout or exit
Changing your password Passwd Changing password for accntname Old passwod New password: Retype new password;
Files File hierarchy? /bin /etc /usr /lib /dev /home cd change directory % cd bin % pwd ; display current directory Pathnames /home/myprogram/os312/test.c
Commands % man command %command [option] [item] %ls %ls –a ; hidden file.cshrc.forward.history.login.logout %echo hello %who mkdir mydirectory rmdir
Commands % rm files % cat Redirect > %cp a b %mv a b Wildcard *
Mail – elm pico emac etc Sendmail popserver smtp server etc
Vi Screen editor Mode Insertion mode I, a Edit mode (command mode)
vi %vi filename ;enter :x ; leave
Simple commands %dw ;delete word %x delete charater %dd 4dd
File manipulation commands %w ;save changes %wq, x ;save and quit %q!
Position within commands ^F forward one screen ^B nG go to line n + next line, j - previous line, k
shell Leave it as it is unless you know what you do
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1 Using Editors Editors let you create and edit ASCII files UNIX normally includes two editors: vi and Emacs Vi and Emacs are screen editors: they display.
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L INUX C OMMAND L INE I NTERFACE G UNAANBAN.G
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1 N305 C Programming. 2 Objectives for the Lab ä Learn problem solving strategies ä Achieve intermediate knowledge of C Programming Language ä Gain experience.
LINUX Tuesday, 5 July :00 pm. Remote Login l Use Secure Shell (ssh) l Machine name/IP address E.g. ssh hydra.sma.nus.edu.sg Or ssh
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