strace

Troubleshooting tool for tracing system calls. More information: https://manned.org/strace.

• Start tracing a specific process by its PID:
  strace -p {{pid}}
• Trace a process and filter output by system call:
  strace -p {{pid}} -e {{system_call_name}}
• Count time, calls, and errors for each system call and report a summary on program exit:
  strace -p {{pid}} -c
• Show the time spent in every system call:
  strace -p {{pid}} -T
• Start tracing a program by executing it:
  strace {{program}}
• Start tracing file operations of a program:
  strace -e trace=file {{program}}