When printing a system call, strace prints the values passed to the kernel or returned from the kernel. The verbose option prints more details for some system calls.

For example, filtering just the sendto() system calls from a single ping looks as follows:

# strace -f -t -e sendto /bin/sh -c "ping -c 1 127.0.0.1"
[pid   430] 21:40:25 sendto(0, "10254325613603102551"..., 64, 0, {sa_family=AF_I4