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Why Use a Cluster?
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High Performance Computing (HPC) typically involves connecting to very large computing systems elsewhere in the world.
These other systems can be used to do work that would either be impossible or much slower or smaller systems.
The standard method of interacting with such systems is via a command line interface called Bash.
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Connecting to the remote HPC system
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Moving around and looking at things
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Your current directory is referred to as the working directory.
To change directories, use cd.
To view files, use ls.
You can view help for a command with man command or command --help.
Hit tab to autocomplete whatever you’re currently typing.
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Writing and reading files
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Use nano to create or edit text files from a terminal.
cat file1 [file2 ...] prints the contents of one or more files to terminal.
mv old dir moves a file or directory to another directory dir.
mv old new renames a file or directory.
cp old new copies a file.
cp old dir copies a file to another directory dir.
rm path deletes (removes) a file.
File extensions are entirely arbitrary on UNIX systems.
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Wildcards and pipes
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The * wildcard is used as a placeholder to match any text that follows a pattern.
Redirect a commands output to a file with >.
Commands can be chained with |
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Scripts, variables, and loops
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A shell script is just a list of bash commands in a text file.
You can use variables and loops to automate tasks that were previously done by hand
chmod +x script.sh will give a script permission to execute.
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