Nt1330 Unit 3 Network Analysis Paper

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In order to access a UNIX system, and use it , you need to connect to the system. You can login: Locally Remotely Login Types In general, there are two ways: Command-line Login GUI Login Connecting Locally Connecting locally means, you are directly logging into the UNIX system. Network connectivity is not required. You could login using the command-line or a GUI interface depending on the system configuration. Example of a GUI login interface on a CentOS machine User enters "username" on this screen and hits enter. User enters the password on this scree and hits "Sign In" Example of a command line login interface (Unix System with no GUI interface) login as: mususer1 password: Note You could have GUI interface installed, and force the command-line login as default. Connecting Remotely To…show more content…
External Commands Examples: grep sort uniq Listing all shell built-in commands - "help" command Bash shell has a command called "help". Just type "help", and hit enter.... it will display all the built-in commands. How do you determine if a given command is an internal or external? You can use one of the following: which command type command Searching all over the filesystem. (... not a preferred way. Instead use type or which) We will use "type" command to determine about the "grep" and "cd" commands: For external commands, the command displays the physical path. For internal commands, the messages indicated that it is a builtin command. $ type grep find is /usr/bin/grep $ $ type cd cd is a shell builtin $ We will use "which" command to determine about the "grep" and "cd" commands: For external commands, the command displays the physical path. For internal commands, there would be no response. $ which grep /bin/grep $ $ which cd $ Internal commands are much faster than external commands, as there is no process to spawn. Well.... you don 't have an internal command for every external

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