You can use strace command to understanding how a linux command work internally. For example, to check on the date command
strace is a system call monitor command and provides information about system calls made by an application, including the call arguments and return value.
# strace -c /bin/date
strace is a system call monitor command and provides information about system calls made by an application, including the call arguments and return value.
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
nan 0.000000 0 5 read
nan 0.000000 0 1 write
nan 0.000000 0 36 30 open
nan 0.000000 0 7 close
nan 0.000000 0 14 9 stat
nan 0.000000 0 8 fstat
nan 0.000000 0 1 lseek
nan 0.000000 0 16 mmap
nan 0.000000 0 7 mprotect
nan 0.000000 0 3 munmap
nan 0.000000 0 3 brk
nan 0.000000 0 2 rt_sigaction
nan 0.000000 0 1 rt_sigprocmask
nan 0.000000 0 1 1 access
nan 0.000000 0 1 execve
nan 0.000000 0 1 uname
nan 0.000000 0 1 getrlimit
nan 0.000000 0 1 arch_prctl
nan 0.000000 0 1 futex
nan 0.000000 0 1 set_tid_address
nan 0.000000 0 1 clock_gettime
nan 0.000000 0 1 set_robust_list
------ ----------- ----------- --------- --------- ----------------
100.00 0.000000 113 40 total
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