High Performance Computing Introduction to Unix

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High Performance Computing Introduction to Unix

• Robert Whitten Jr

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Welcome!

• Todays Agenda
• Questions from last week
• Unix commands you cant live without
• File systems
• Shell scripting

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From last time

• Send me that email if you havent already
• whittenrm1_at_ornl.gov
• Apply for an account
• http//www.nccs.gov/user-support/access/account-re
  quest/
• Download and install cygwin
• Download putty.exe
• Get the website up!
• http//www.nccs.gov/user-support/training-educatio
  n/workshops/high-performance-scientific-computing/

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Unix commands you cant live without

• passwd change local password
• man read system manual pages
• pwd identify the working directory
• cd change the working directory
• echo display a string
• ls display contents of directory
• cat display text of file
• more display text of file
• cp copy a file
• mv move a file
• rm remove a file
• mkdir create a directory
• rmdir remove a directory

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Unix file system

• Hierarchical file structure
• Directories
• Files
• Directories
• Contain files and/or other directories
  (subdirectories)
• Files
• Contain data (text, binary, etc)

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Hierarchical (tree) file system

• There is one parent directory per file system
• Root aka /
• Everything else is contained in this directory
• Subdirectories
• Files
• Pathnames name (address) of the file/directory
• /ccs/home/rmwjr
• Absolute vs. relative pathnames
• Navigating directories
• Creating files, directories
• Redirection, pipes

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Shell scripts

• Programs to help automate recurring task
• Text files that are interpreted by shell program
• Interpreted vs compiled languages
• Example

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Questions?
http//www.nccs.gov
Oak Ridge National Laboratory
U. S. Department Of Energy 8