余森彬 justdoit0823

Netcat Examples

Establish TCP Connection

Connect to network host over TCP connection

Message

HTTP messages consist of requests from client to server and responses from server to client.

HTTP-message   = Request | Response     ; HTTP/1.1 messages
generic-message = start-line

Command

ldd

lddb executable_file

In some circumstances, some versions of ldd may attempt to obtain the dependency information by directly executing the program.

File Record lock

As well as being removed by an explicit F_UNLCK, record locks are automatically released when the process terminates or if it closes any file descriptor referring to a file on which locks are held. This is bad: it means that a process can lose the locks on a file like /etc/passwd or /etc/mtab when for some reason a library function decides to open, read and close it.

Record locks are not inherited by a child created via fork(2), but are preserved across an execve(2).

Because of the buffering performed by the stdio(3) library, the use of record locking with routines in that package should be avoided; use read(2) and write(2) instead.


	# get processes with related threads
	ps -eLf \|grep "process name"

	# list all opened file descriptors in a process PID and under which thread
	lsof -aKp PID

	# trace syscalls in a process's main thread or other thread PID
	strace -p PID


	#include "Python.h"


	PyTypeObject * create_type(const char * name){
	PyObject * args, * dict, * value;
	PyTypeObject * type;

	args = PyTuple_New(3);
	PyTuple_SetItem(args, 0, PyUnicode_FromString(name));

	var tables = document.getElementsByTagName('table');

	for(var i=0; i < tables.length; i ++) {
	for(var j=0; j < tables[i].childNodes[0].childNodes.length; j++){
	if(j == 0) {
	console.log('====' + tables[i].childNodes[0].childNodes[j].innerText + '=====');
	}
	else {
	console.log(tables[i].childNodes[0].childNodes[j].childNodes[0].innerText, tables[i].childNodes[0].childNodes[j].childNodes[1].innerText);
	}

	(defun load-protobuf ()
	"Load protobuf."
	(add-to-list 'load-path "~/.emacs.d/el-get/protobuf-mode")
	(require 'protobuf-mode)
	(add-to-list 'auto-mode-alist '("\\.proto\\'" . protobuf-mode))
	(add-hook 'protobuf-mode-hook (lambda () (auto-complete-mode)))
	)


	drop table if exists s_user_table;
	create table s_user_table (
	id int,
	user_id int
	);


	drop table if exists s_user_cnt_table;
	create table s_user_cnt_table (


	load data infile 'src.csv' into table dest_table FIELDS TERMINATED BY ',' ENCLOSED BY '"';