Session 2 Wharton Summer Tech Camp

Session 2Wharton Summer Tech Camp Basic Unix

Agenda • Cover basic UNIX commands and useful functions

UNIX • Operating System • AT&T – Bell Lab 1969 • Ken Thompson, Dennis Ritchie, Brian Kernighan, etc(picture: Ken Thompson and Dennis Ritchie standing) • Linux, Mac OSX descended from Unix • For Windows, Unix-like environment can be achieved by • Just Logging into Unix.wharton.upenn.edu OR • Install cygwinwww.cygwin.com/

Wharton Grid

Unix Prompt • [leedok@hpc-login2 ~]$ Current Directory name (~ means home) user name network node hostname

Unix Shell • Unix Shell: A Unix shell is a command-line interpreter or shell that provides a traditional user interface for the Unix operating system and for Unix-like systems. (WIKI) • Basically, a translator between unix OS (kernel) and user, delivering commands. • There are many varieties: bash, tcsh, csh, ksh • Bash is the most popular

Information look up • Manual page: “man [command]” “man man” • Google everything! • Stackoverflow.com

Command Structure • [Command] [Options] [Argument] • ls –l directory • Directory structure separated by “/” • /home/opim/leedok • Important Startup File: ~/.bash_profile Directory name. By default, if you don’t specify, it’s current working directory “.” Command for listing directory contents Command for listing directory contents

Control-key commands • ctrl-c • interrupts a runningprogram • ctrl-z • suspends a running program • (use the fg command to continue the program)

Directory Navigation • ls - list content of a directory • pwd– print working directory • cd – change directory • mv– move file or rename • cp - create a copy of a file • rm– remove a file • mkdir– create a new directory • rmdir– remove a directory

Some other commands • who - list who is on system • echo, printf– display a message • script- log all interaction in a file • clear- clear the screen • cat, more, less – file perusal • du – file info • chmod– change permission • find: • By Name: find . –name \*.ado • By Type: find . –type d (directory) • Etc

Pipes and Redirects • > - Redirect output from a command to a file on disk. • >> - Append output from a command to an existing file on disk. • < - Read a command's input from a disk file, rather than the user. • | - Pass the output of one command to another for further processing. • Date > date.txt • Date >> date.txt • who | cut -f1 -d" " | sort -u

Bit more advanced commands • grep – match string patterns (search) • sed, awk– find and replace (text manipulation)

Lab session • Do some exercise posted “practice.sh” • Do Unix tutorial if you are new to it http://www.ee.surrey.ac.uk/Teaching/Unix/ 1: Log into unix account if you have one Sshuname@unix.wharton.upenn.edu 2: If you have Mac OS, just open up the “Terminal” 3: If you have Linux, you probably know this 4: if you have Windows, download terminal applications (e.g., putty, secureCRTetc)

For the next session • Download and install Canopy – packaged python • https://www.enthought.com/products/canopy/academic/ • People with EDU email gets it for free

Session 2 Wharton Summer Tech Camp