Basic commands

Basic commands - Introducing the UNIX Operating System...

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Introducing UNIX EMBnet www.embnet.org slide 1 Introducing the UNIX Operating System
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Introducing UNIX EMBnet www.embnet.org slide 2 What is UNIX ? A family of operating systems IRIX SOLARIS AIX LINUX Digital UNIX HP-UX ... Multitasking Runs more than one program at the same time. A busy system can be running several hundred or even thousands of programs at the same time. Multiuser Many different people can use the system at the same time. Networked It is designed to be linked to other computers and to allow people to work over a network. The network IS the computer.
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Introducing UNIX EMBnet www.embnet.org slide 3 X Xprog X · unix> help Press ENTER to continue: UNIX Kernel What does UNIX do? The Computer Easier to use than the shell but less powerful remote machines at the same time. users User Interaction Many different users, typically accessing the system from remote machines in different ways
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Introducing UNIX EMBnet www.embnet.org slide 4 Unix doesn’t really care where you log in from, though some system administrators might. Logging in Log in from anywhere you have permission Have graphical output sent anywhere you have permission You must have a username (login id) to use a unix system This identifies you to the system so it can manage your work properly. Every user is a member of one or more groups of users. This helps the system manage different types of user properly.
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Introducing UNIX EMBnet www.embnet.org slide 5 Connecting to embnet.org Connected. Welcome to the European Molecular Biology Network. Login: Logging in Connect to the unix machine using a suitable program on your local machine. Telnet Xterm Secure Shell Kermit username Password: unix doesn’t show anything on the screen as you type your password. The system will be unavailable on friday afternoon for maintenance. You have new mail. username@embnet ~> You may get some messages here from the system administrator.
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Introducing UNIX EMBnet www.embnet.org slide 6 The shell or command line Several different shells but they behave more or less the same username@embnet ~> your username are logged in to your present location The prompt can be customised to look how you wish 1. The Prompt.
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Introducing UNIX EMBnet www.embnet.org slide 7 The shell or command line 2. Commands username@embnet ~> The shell breaks the command up into individual words ls -ald *.txt The first word is a command ls -ald *.txt ls The subsequent words form a list of arguments -ald *.txt ls -ald * .txt It means ‘any group of characters’ (including none). The shell finds all the filenames that match anything .txt and adds them to the list of arguments By default the boundary between words is a space.
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This note was uploaded on 07/15/2011 for the course ECO 2023 taught by Professor Mr.raza during the Summer '10 term at FAU.

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Basic commands - Introducing the UNIX Operating System...

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