Future of Computing and Linux 1 13 2011 Opening Discussion Have you come up with any other questions about the course Minute essay comments Why no creepy military tech Harvard Architecture Where is Scala used Why Scala If computers take over everything how will noncomputer people make money How long until self driving cars will be in Texas What is CES More Comments How far will we get into coding Cutting Edge http www youtube com watch v 6zXOW6v0c8s Computing Power GPU CPU Mobile The Power of Exponential Growth GPU CPU Mobile Cost GFLOP http en wikipedia org wiki FLOPS Hardware costs Linux Go ahead and log in Linux is just another OS like Windows or Mac OS Linux is primarily used in servers Efforts are being put into making it a desktop OS It has a GUI but we will focus on doing things through the command line Bring up a terminal Change your password with passwd Command Line You are likely used to the point and click interface of a GUI To run a program you double click on it or a file associated with it Any other information has to be given after the program opens With the command line you type in the name of the program you want to run You can also specify any other information you want through command line arguments Files and Directories What you call folders were originally directories Commands pwd See current directory ls List the contents of a directory mkdir rmdir Make and remove directories cp mv rm Copy move remove files less more cat See contents of files Tips Tab completion for file directory names for last matching command Ctrl r to search your history The man command for manual entries Use the k option to search Permissions Do ls with l option to see permissions Sets of rwx for user group and others Use whoami and groups to find identity Use chmod and chown to change permissions or ownership Remote Use ssh to login into one machine from another Use scp to copy files from one machine to another The website has a link to Putty which will give you these abilities from Windows For Windows consider running a virtual Linux install Other du Lists disk usage grep Searches for something inside of files find Find files head List the first several lines of a file tail List the last several lines of a file top Look at what is running on a machine w Look at who is logged into a machine I O Redirection You can send a programs output to a file using or You can make a program use a file as input using You can do more interesting things by sending the output of one program to another with Minute Essay Have you ever used a command line interface before What do you think of them based on what you have seen today Try connecting to one of the Xena machines from your room For example xena08 cs trinity edu
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