##linux environment programming

1. signal use [ ctrl + \ | generate SIGQUIT signal]
2. sigaction use [ ctrl + c | generate SIGINT signal]
3. set signal block
4. alarm.c [ timer ]
5. super_system.c [ support linux system return, only last one row ]
6. pipe.c [use normal operation, parent<->child process interactive]
7. pipe_fdopen.c [use fdopen, parent<->child process interactive]
8. strtok.c [string split, using strtok, origin string be modified]
9. array_pointer.c [string split, return Two-dimensional array]
10. strip.c [use ispace, delete start and end space character]
11. split.c [use specify character split, return array pointer]
12. setnic.c [use ethtool close NIC parameter, using saas ]
13. skiplist.c [skiplist repalce balance tree, serarch log(n)]
14. strim.c [delete specify character in string]