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Linux workstation Week 3

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Linux Unix: AT&T Laboratories, 1969 Ken Thompson and Dennis Ritchie GNU: the GNU OS, Hurd GNU General Public License BSD: Berkeley Software Distribution, 1977 USL(AT&T) v. BSDi MINIX: Andrew S. Tanenbaum, 1987 16-bit, microkernel Birth of Intel 386 (32-bit)

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Freax! Linux: Linus Torvalds Monolithic kernel 32-bit (Intel 386 \:D/) GNU/Linux (FYI) Monolithic Microkernel Hybrid

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Linux Distros Fedora (Red Hat) openSUSE (Novell) Ubuntu (Canonical Ltd.) Mandriva Linux (Madriva) Debian Mageia

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NTUIM GNU/Linux Workstations 140.112.106.6 (mercury) 140.112.106.9 (mars)

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SSH vs. Telnet Both connect to remote servers Telnet by default Plain text No encryption No authentication SSH More secure More overhead

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PuTTY/PieTTY A small and safe Telnet/SSH remote client PuTTY http://the.earth.li/~sgtatham/putty/latest/x86/putty. exe http://the.earth.li/~sgtatham/putty/latest/x86/putty. exe PieTTY http://ntu.csie.org/~piaip/pietty/ http://ntu.csie.org/~piaip/pietty/ Unicode Just input servers address, tick SSH, and youre on!

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Uses Compile your C/C++ code OS (thread) Network (socket) Manage your files

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UNIX File and Directory File A sequence of bytes Directory A file that includes info on how to find other files vmunix / dev consolelp0 bin csh lib libc.a usr include etc passwd

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File Permission (1/2) Output of ls -l total 4 lrwxr-xr-x 1 test user 18 Aug 28 13:41 home -> /usr/people/maria/ -rw-r--r-- 1 test user 94 Aug 28 13:42 nothing.txt drwxr-xr-x 2 test user 9 Aug 28 13:40 test_dir/ File type Permissions Owner GroupModify date File name

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File Permission (2/2) File permissions Permissions used to allow/disallow access to file/directory contents Owner/Group/Other Read (r) 4, write (w) 2, and execute (x) 1 For owner, group, and world (everyone) chmod chmod 700 file.txt chmod g+rw file.txt

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Some commands CommandOutcome cd [directory name]Change directory cd..Change to parent directory lsList information about current directory pwdPrint current working directory clearClear terminal screen chmodChange the access permissions of files and directories unamePrint system information passwdModify a user password mkdir [dir. name]Create new folder rm [file name]Remove file Rmdir [dir. name]Remove directory cp [origin] [dest.]Copy file

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More commands CommandOutcome vim [file name]Open Vim text editor for file name > [file name]Print returned result to file name | grepSearch result for matching expression./[executable]Execute program executable cat [file name]Read file name (there are other uses) Vim CommandOutcome Standby for command :qQuit :q!Force quit :wWrite file aInsert text

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Homework Linux command

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Due Day: 2012/10/3 /home/r101042/labtemp execute_me ( labtemp ) answer.txt vim result.txt labtemp 3 special.txt

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Q&A Thanks for attention!