trap:tldr:eac20

The command "trap -l" is used in Unix-like operating systems (such as Linux) to list the available signals and their corresponding names or numbers.

In Unix, signals are a way of communication between the operating system and running processes. They can be sent to processes to notify them of events or conditions, such as the termination of a process, a user interrupt, or a software error.

The "trap" command in Unix is used to catch and handle signals within a script or shell. It allows you to define what action or commands should be executed when a specific signal is received.

When used with the "-l" option, "trap -l" lists all the available signals that can be caught and handled by the "trap" command. These signals are identified by names or numbers, such as "SIGTERM" for termination signal, "SIGINT" for interrupt signal (usually generated by pressing Ctrl+C), and so on.

Running "trap -l" will display a list of all the available signals along with their corresponding names or numbers, which can be helpful when writing scripts or programs that deal with signal handling.