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The Personal Computer and its file management An introduction for non-MS users.

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Presentation on theme: "The Personal Computer and its file management An introduction for non-MS users."— Presentation transcript:

1 The Personal Computer and its file management An introduction for non-MS users

2 Overview Introduction to File Management Some important techniques An example : CDS/ISIS file structure Networking Security issues

3 Introduction The computer is a container of files which can be processed by the CPU Most files are on the harddisk in a ‘file system’ All actions on the computer are based somehow on file access : reading files (input) and writing files (output)

4 Hierarchical File Structure All files are stored in a (inverterd) tree-like hierarchical structure : ROOT C:\ C:\WINDOWS C:\WINDOWS\SYSTEM 32 C:\Program Files C:\Documents and Settings C:\TEMPC:\ISIS C:\ISIS\DATA C:\ISIS\DATA\CDS C:\ISIS\DATA\MYDB C:\ISIS\MENU C:\ISIS\PROG

5 File Names Proper (‘first’) name and extension part (family name), separated by ‘.’ The extension indicates the type of file Old style : 8.3 format, e.g. MyArticl.doc New style : long names, multiple extensions, e.g. MyArticle.doc.backup When necessary : reduction of long to short names : e.g. MyArti~1.doc

6 Types of files ‘Executable files’ : (only when called by.exe) > binary files Data-files : all other extensions E.g..doc,.txt,.dbf,.mdb,.php,.htm(l) ISIS :.MST,.XRF,.PFT,.FST,.IFP … > binary (or mixed) or ASCII (readable characters only) files

7 File Associations In Windows (and other operating systems as interfaces) data-files can be linked to executables to have the executable automatically launched with the data-file as input when clicked, if the executable is fully Windows-compatible Other softwares (e.g. ISIS) provide their own mechanisms to automatically open data-files How : assign extension to executable (Tools|Folder Options|File Types|…) or : Right- click|Properties|Open With|.. or …

8 Make file extensions visible ! Windows ‘hides’ known extensions and provides icons to distinguish them, but… In order to fully control your system : My Computer|Tools|Folder Options|View|uncheck ‘hide extensions for known file types’

9 The command-line Open a black ‘DOS-box’ or console > Start|Run|’cmd’ (or ‘command’ previously) Type commands at the command prompt (no case-sensitivity) : E.g. ‘dir’- CD windows E.g. ‘cls’- cd system32 E.g. dir |more- cD.. E.g. dir >filelist- Cd \windows\system32 E.g. type filelist- cd \ E.g. edit filelist - del *.* (???!!?!!??)

10 Working with ASCII-files ASCII : only the first 256 characters defined in the ASCII (or UNICODE-)table can be used First 128 : fixed, e.g. A=65 and a=97, 127=DEL, 32=, 7=BELL etc. Second 128 : extended, variable, e.g. 128=Ç, 156= £, 225=ß, etc. Beware : ASCII <> ANSI (Windows table) ! NOTEPAD for editing ASCII-files, in Windows : ‘text-files’ (= with extension.TXT)

11 Something about (UNIX/) Linux More secure, rigid and professional OS Availability : Commercial versions (e.g. SCO, HP, AIX..) Free versions, e.g. Free BSD Open source version, a.o. Linux, Solaris (since 14/06/2005!) Originally : command consoles (like DOS), shell or terminal Now : graphical (Windows-like) interface(s), e.g. KDE, Gnome Main differences file system : Case sensitive naming ‘/’ instead of ‘\’ do denote directory-levels Multi-user Security

12 ISIS-file management To get after full installation of WinISIS : C:\WinISIS\ \WinISIS\PROG\ \WinISIS\MENU\ \WinISIS\MSG\ \WinISIS\WORK\ \WinISIS\DATA\with.PAR-files for each DB \WinISIS\DATA\MyDB \WinISIS\DATA\Data2 etc…

13 ISIS file management An ISIS database consists of many (at least 10) files : MST XRF IFP (N01, N02, L01, L02, CNT) FDT FST(‘s) PFT(‘s)

14 Networking Protocols : > Network|Properties| Windows Network Client -> LAN TCP/IP -> Internet Properties : IP, Subnet, Gateway, DNS DHCP ‘Mapping of network drives’ : added to list of storage devices with identifier (D-Z)

15 Security issues Anti-virus What are viruses ? Protection : all incoming data scanned for ‘signatures’ Softwares : commercial and free Firewall Worms and Trojans Ports protection Windows Firewall Pest control etc…

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