[user02@FC4 Lesson12]$ cat -n syscall.c

   1  #include <stdlib.h>
   2
   3  int main(void)
   4  {
   5     system("ls");
   6
   7     return 0;

   8  }

[user02@FC4 Lesson12]$ gcc -o syscall syscall.c
[user02@FC4 Lesson12]$ ./syscall
bcc.txt cpp.txt showtime showtime.cpp sqrt.c syscall syscall.cpp vcgpp.txt
cint.txt c.txt showtime.c sqrt sqrt.cpp syscall.c vcgcc.txt
[user02@FC4 Lesson12]$