tldr/pages/sunos/truss.md

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# truss
> Troubleshooting tool for tracing system calls.
> SunOS equivalent of strace.
- Start tracing a program by executing it, following all child processes:
`truss -f {{program}}`
- Start tracing a specific process by its PID:
`truss -p {{pid}}`
- Start tracing a program by executing it, showing arguments and environment variables:
`truss -a -e {{program}}`
- Count time, calls, and errors for each system call and report a summary on program exit:
`truss -c -p {{pid}}`
- Trace a process filtering output by system call:
`truss -p {{pid}} -t {{system_call_name}}`