1. SEC 13F
A filing with the Securities and Exchange Commission (SEC), also known as the Information Required of Institutional Investment Managers Form. It is a quarterly filing required of institutional investment managers with over $100 million in qualifying assets. Companies required to file SEC Form 13-F may include insurance companies, banks, pension funds, investment advisers and broker-dealers. This
form, which must be filed within 45 days of the end of each quarter, contains information about the investment manager and potentially a list of their recent investment holdings.
2. SEC 13D
A form that must be filed with the SEC under Rule 13D. The form is required when a person or group acquires more than 5% of any class of a company\'s shares. This information must be disclosed within 10 days of the transaction. Rule 13D requires the owner to also disclose any other person who has voting power or the power to sell the security.
3. SEC SC 13G, SC 13G/A
An SEC form similar to the Schedule 13D used to report a party&# 39;s ownership of stock that is over 5% of the company. Schedule 13G is shorter and requires less information from the filing party. Ownership of over 5% in a publicly-traded stock is considered to be significant ownership, and therefore must be reported to the public
tar 命令可以为Linux的文件和目录创建档案。利用 tar，可以为某一特定文件创建档案（备份文件），也可以在档案中改变文件，或者向档案中加入新的文件。tar 最初被用来在磁带上创建档案，现在，用户可以在任何设备上创建档案。利用 tar 命令，可以把一大堆的文件和目录全部打包成一个文件，这对于备份文件或将几个文件组合成为一个文件以便于网络传输是非常有用的。
谢谢！