Command Line
Using Screen to Detach Processes The screen command allows users to detach interactive terminal sessions and reattach them later. This allows processes running within a screen session to continue executing even after disconnecting the SSH session that started it. To start a screen session, simply run the screen command. You will be presented with a…
Keeping SSH Sessions Alive with Tmux Tmux is a terminal multiplexer that enables multiple terminal sessions to be accessed and controlled from a single screen. By multiplexing the terminal, it is possible to detach and reattach terminal sessions while keeping the programs running in the background. This makes tmux ideal for managing long-running SSH connections….
Keeping Remote Processes Running After SSH Session Ends When working on remote servers over SSH, initiating long-running processes can be problematic. By default, when the SSH session disconnects, the remote shell also exits, killing any child processes started in that session. Methods like nohup, disown, and backgrounding allow processes to continue running after the SSH…
When working on remote servers over SSH, processes and tasks started in the SSH session will terminate when the network connection drops or the client disconnects. However, in many cases we want long-running processes, such as training machine learning models, downloading large files, or running computational workflows, to continue executing in the background after we…
When to Use Globs vs Regular Expressions Glob patterns, also known as wildcards, are a simple pattern matching syntax used to match file and directory names in Linux and other Unix-like operating systems. Regular expressions are a more advanced way of defining search patterns that support a wider range of matching capabilities. Globs excel at…
The POSIX (Portable Operating System Interface) standards specify several flavors of regular expressions used in programming languages and text processing. This article will explore the history, core syntax, and key features of basic POSIX regular expressions, extended POSIX regular expressions, and Perl-compatible regular expressions (PCRE). History of POSIX and regex standards The Institute of Electrical…
What is a Shell and Why Do You Need One A shell is a user interface that provides an environment for accessing a computer’s services. It is the outer layer between the user and the operating system kernel and is used to execute other programs. Shells provide a command line interface (CLI) to give instructions…
What is reptyr and When To Use It reptyr is a utility program that allows attaching running Linux processes to a new terminal (TTY). It works by sending a SIGSTOP signal to the process to pause it, reassigning it to a new TTY device, and sending a SIGCONT signal to resume the process on the…
GNU Screen is a terminal multiplexer that allows you to run multiple shell sessions in a single terminal window. With Screen, you can detach and reattach sessions, enabling you to keep processes running on a remote server even after disconnecting. In this 6000-word guide, we will cover using GNU Screen to pause and resume sessions…
Keeping SSH Sessions Active After Disconnection The SSH client can be configured to keep sessions open with the ClientAliveInterval setting. This will send keepalive packets periodically to prevent the server from dropping the connection due to inactivity. Using nohup and appending & will allow processes to continue running even after disconnecting from an SSH session….