truss:tldr:5979e

The command "truss -f ${program}" is used to trace the system calls and signals of a program in real-time on UNIX-based systems.

Here's a breakdown of the command:

• "truss": This is the name of the command-line tool used to trace system calls and signals.
• "-f": This option tells truss to trace all child processes spawned by the program. It means that if the specified ${program} creates any child processes, truss will also trace them.
• "${program}": This is a placeholder that should be replaced with the name or path of the program you want to trace. It can be any executable file or a command that exists on your system.

By running this command, truss will start the specified ${program} and trace all the system calls, signals, and related information associated with it. This trace can provide valuable insight into the program's behavior, including how it interacts with the operating system and any errors or exceptions it encounters.