fin

Start the project in the current directory

$ fin project start

$ fin project stop

$ fin bash [container_name]

$ fin logs [container_name]

$ fin logs [[-f|--follow]] [container_name]

fin [-s signal]

-s signal
    Specifies the signal to send to the process. The 'signal' argument can be a signal name (e.g., SIGUSR1, SIGTERM) or a signal number. If not specified, defaults to SIGUSR1. Signal names are case-insensitive.

process_id
    The process ID of the process to send the signal to. This is a mandatory argument. It can be acquired through standard commands, like ps or jobs.

The `fin` command is a simple utility designed to signal the completion of a background job or task. It primarily serves as a means of inter-process communication, allowing one process (typically a long-running background job) to notify another process (e.g., a monitoring script or a user's terminal) that it has finished executing. This is often achieved by sending a signal, such as SIGUSR1 or SIGUSR2, to a specified process ID (PID). Its usefulness lies in scenarios where you need to perform actions immediately after a job finishes, without constantly polling its status. The fin command enables asynchronous event notification, improving the efficiency and responsiveness of automated workflows. It is valuable in automating complex processes and reducing the need for manual supervision of tasks. The command can be enhanced through wrappers to enhance functionality, such as sending email or launching another process when the background task completes.

The process ID must be a valid process ID running on the system, and the user running fin must have sufficient permissions to send a signal to that process. If an invalid PID is provided or if the user lacks permissions, the command will likely fail with an error.
Signals can be blocked or ignored by the target process, potentially preventing fin from having any effect.

Signals are a fundamental mechanism for inter-process communication in Unix-like systems. They are used to notify a process of an event. Standard signals include SIGTERM (termination request), SIGKILL (forced termination), SIGHUP (hangup signal), and SIGUSR1/SIGUSR2 (user-defined signals). fin leverages this signal mechanism to indicate task completion. The choice of signal used is often a matter of convention or application-specific requirements. Using user-defined signals (SIGUSR1/SIGUSR2) is generally recommended to avoid conflicts with signals that have predefined meanings within the system.

kill(1), ps(1), jobs(1), wait(1)