truss: add page (#2907)

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}}`