HPC systems are usually accessed via a Linux-based Command Line Interface (CLI). Via the CLI, users can run programs to manipulate files, load additional software, or execute programs.

While there are many similarities to single-user Linux systems, HPC systems differ widely in the management of provided Software packages, and users must pay attention to the locality of data.

• Describe the command line interface and the bash shell as well es perform basic commands.
• Use and write basic shell scripts, e.g., to automate the execution of several commands.
• Sketch the organization of the typical file system tree.
• Utilize essential tools to navigate and manage files.
• Understand how to access a Cluster via SSH.
• Understand terminal multiplexers and use them to run longer commands without keeping a connection alive.
• Utilize tools to transfer data between a desktop/laptop system and a remote HPC system.
• Utilize package management tools that provide access to a wide variety of software.
• Demonstrate the usage of an editor to open a file in write mode and save the file and define why CLI based editors are useful in an HPC environment.
• Utilize screen or tmux to preserve a session between logins and classify usecases for these three operations:
  • Creation of a session.
  • Detaching from the current session.
  • Resuming a previous session.
• Illustrate the use of CTRL-Z and CTRL-C in combination with the commands jobs and fg to send the signals SIGINT and SIGTSTP.
• Experiment with the kill command and send the signals SIGKILL, SIGINT, SIGTSTP, also via the numbers instead of the names to a specific process id

• USE1.1 Command Line Interface
• USE1.2 Shell Scripts
• USE1.3 UNIX File System Tree
• USE1.4 Remote Access
• USE1.5 Software Environment
• USE1.6 CLI File editors
• USE1.7 Terminal multiplexer
• USE1.8 Manage background processes and signals