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Table of Contents

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titleOther Windows ssh/Terminal options

If your Windows version does not have ssh in Command Prompt or PowerShell:

More advanced options for those who want a full Linux environment on their Windows system:

From now on, when we refer to "Terminal", it is either the Mac/Linux Terminal program, Windows Command Prompt or PowerShell, or the PuTTY program.

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  • Answer yes to the SSH security question prompt
    • this will only be asked the 1st time you access ls6
  • Enter the password associated with your TACC account
    • for security reasons, your password characters will not be echoed to the screen
  • Get your 2-factor authentication code from your phone's TACC Token app, and type it in
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titleLogging in with PuTTY

If you're using PuTTY as your Terminal from Windows:

  • Double-click the Putty icon
  • In the PuTTY Configuration window
    • make sure the Connection type is SSH
    • enter ls6.tacc.utexas.edu for Host Name
      • Optional: to save this configuration for further use:
        • Enter Lonestar6 into the Saved Sessions text box, then click Save
        • Next time select Lonestar6 from the Saved Sessions list and click Load.
    • click Open button
    • answer Yes to the SSH security question
  • In the PuTTY terminal
    • enter your TACC user id after the "login as:" prompt, then Enter
    • enter the password associated with your TACC account
    • provide your 2-factor authentication code

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The Terminal is pretty "dumb" – just sending what you type over its secure sockets layer (SSL) connection to TACC, then displaying the text sent back by the shell. The real work is being done on the remote computer, by executable programs called by the bash shell (also called commands, since you call them on the command line).

image-2023-4-26_9-27-6.pngImage RemovedImage Added

About the command line

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Now execute the lines below to set up a login script, called ~/.bashrc. [ Note the tilde ( ~ ) is shorthand for "my Home directory". See See Linux fundamentals: pathname Pathname syntax ]

When you login via an interactive shell, a well-known script is executed to establish your favorite environment settings. The well-known filename is ~/.bashrc (or ~/.profile on some systems), which is specific to the bash shell.

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Code Block
languagebash
# show a long listing of all files in the current directory, including "dot files" that start with a period
ls -la  

(Read more about File attributes)

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titleWhat is chmod doing?

What's going on with chmod?

The chmod 600 ~/.bashrc command marks the file as readable and writable only by you.
The .bashrc script file will not be executed unless it has these exact permissions settings.

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Tip

$WORK and $SCRATCH are TACC environment variables that refer to your Work and Scratch file system areas – more on these file system areas soon. (Read more about Environment variables)

Unlink

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titleWhat is "ln -s" doing?

The ln -s command creates a symbolic link, a shortcut to the linked file or directory.

  • Here the link targets are your Work and Scratch file system areas
  • Having these link shortcuts will help when you want to copy files to your Work or Scratch, and when you navigate the TACC file system using a remote SFTP client
  • Always change directory (cd) to the directory where we want the links created before executing ln -s
    • Here we want the links under your home directory (cd with no arguments)

Want to know where a link points to? Use ls with the -l (long listing) option.

Code Block
languagebash
titlels -l shows where links go
ls -l


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Code Block
languagebash
ls $CORENGS

(Read more about Environment variables)

Shell completion with Tab

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Here's how the common login script adds the ~/local/bin directory you created above, to the location list, along with a special dot character ( . ) that means "here", or "whatever the current directory is". In the statement below, colon ( : ) separates directories in the list. (Read more about pathname Pathname syntax)

Code Block
languagebash
titleAdding directories to PATH
export PATH=.:$HOME/local/bin:$PATH

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