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,system_call2,...

• 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 and specify the maximum string size to print:

strace -p pid -T -s 32

• Start tracing a program by executing it:

strace program

• Start tracing file operations of a program:

strace -e trace=file program

• Start tracing network operations of a program as well as all its forked and child processes, saving the output to a file:

strace -f -e trace=network -o trace.txt program