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