ebcdic

Ingres database, the code may undergo a strange conversion: "The cat in the hat" is changed to "hT eac tnit ehh ta". The method to recover data is to use the dd command: Dd if = randys_bad_data of = marcs_good_data conv = swab The last section "conv = swab" tells dd to adopt the "swap bytes" conversion method. Similarly, if you want to convert data in the EBCDIC format to the ASCII format, you can use the following command: Dd if = ebcdic_file of = a

receiving end of the TCP Transport Layer Protocol only allows the other end to send data that can be accepted by the receiving end buffer. This will prevent the buffer overflow of the slow host caused by the fast host. The two applications exchange byte streams consisting of 8-bit bytes over TCP connections. TCP does not insert record identifiers in byte streams. We call this bytestreamservice ). If the application of one party first transmits 10 bytes, then 20 bytes, and then 50 bytes, the oth

to authenticate files or messages between the system or the user. HMAC (forThe key hashing method for message authentication is an example of this function. NBSP;NBSP;CRC (Cyclic redundancy check): Cyclic redundancy check code, CRC verification due to simple implementation, the ability to detect errors, is widely used in various data validation applications. Less system resources, hardware and software can be achieved, is a data transmission error detection is a good means (CRC is not strictly

: The path of data transmission is established through the Transport Layer (port number: Transport port and receive port). Primarily initiates a session between your systems or accepts a session request (the device needs to know each other either IP or Mac or hostname)6. Presentation layer: Ensures that the information sent by the application layer of one system can be read by the application layer of the other system. For example, a PC program communicates with another computer, where one compu

service (Bytestreamservice). If one party's application passes 10 bytes, then 20 bytes, and then 50 bytes, the other side of the connection will not know how many bytes the sender sent each time. The receiver pays can receive these 80 bytes 4 times and receive 20 bytes at a time. One end places the byte stream on the TCP connection, and the same byte stream appears at the other end of the TCP connection. In addition, TCP does not explain the content of the byte stream. TCP does not know whether

web page cannot be placed close to the top of the browser, because there are three characters at the beginning of HTML! Representation of byte sequence tags of different encodings Encoding (Hexadecimal) (Decimal) UTF-8 EF BB BF 239 187 191 UTF-16 (large order) Fe FF 254 255 UTF-16 (small order) FF fe 255 254 UTF-32 (large order) 00 00 Fe FF 0 0 254 255 UTF-32 (small order)

Beautifulsoup Encoding Beautifulsoup uses Unicode internally. beautifulsoup automatically detects the encoding type of the input file and converts it to Unicode. Beautifulsoup encoding detection sequence Beautifulsoup: Fromencoding parameter passed during soup object creation; Encoding defined by the XML/html file; The encoding feature represented by several bytes in the file. The encoding that can be judged at this time can only be one of the following encodings: UTF-*,

', ' windows-1251 ', ' windows-1252 ', ' windows-1253 ', ' windows-1254 ', ' windows-1255 ', ' Windows-1256 ', ' windows-1257 ', ' windows-1258 ', ' Johab ', ' Macintosh ', ' X-mac-japanese ', ' X-mac-chinesetrad ', ' X-mac-korean ', ' X-mac-arabic ', ' X-mac-hebrew ', ' X-mac-greek ', ' X-mac-cyrillic ', ' X-mac-chinesesimp ', ' X-mac-romanian ', ' X-mac-ukrainian ', ' X-mac-thai ', ' X-mac-ce ', ' X-mac-icelandic ', ' X-mac-turkish ', ' X-mac-croatian ', ' X-chinese-cns ', ' X-cp20001 ', ' X-

the other system. For example, a PC program communicates with another computer, where one computer uses an extended 210 binary Interchange Code (EBCDIC) and the other uses the U.S. Information Interchange Standard Code (ASCII) to represent the same characters. If necessary, the presentation layer enables conversion between multiple data formats by using a pass-through format."7" Application layer: The OSI layer closest to the user, which provides net

-1256 ','Windows-1257 ','Windows-1258 ','Job ','Macintosh ','X-mac-japanese ','X-mac-chinesetrad ','X-mac-kore ','X-mac-arabic ','X-mac-hebrew ','X-mac-greek ','X-mac-cyrillic ','X-mac-chinesesimp ','X-mac-romanian ','X-mac-ukrainian ','X-mac-thai ','X-mac-ce ','X-mac-icelandic ','X-mac-turkish ','X-mac-croatian ','X-chinese-cns ','X-cp20001 ','X-chinese-eten ','X-cp20003 ','X-cp20004 ','X-cp20005 ','X-ia5 ','X-ia5-german ','X-ia5-swedish ','X-ia5-norwegian ','US-ascii ','X-cp20261 ','X-cp20269

following command. Here the parameter '' is used to run the parcellite later processes. # Parcellite amp; Check options are enabled in gvim. # Gvim -- version Make sure that the "+ xterm_clipboard" option is displayed in the following output. VIM-ViIMproved7.2 (2008Aug9, compiled Apr5201210: 12: 08) Encoded ded patches: 1-411 Modifiedby lt; bugzilla@RedHat.com gt; Compiledby bugzilla@redhat.com; Huge version with GTK2 GUI. Features encoded ded (+) ornot (-): + Arabic + autocmd +

layer is to provide a common language for heterogeneous machine communication so that it can Interoperate. This type of service is needed because different computer architectures use different data representations. For example, IBM hosts use EBCDIC encoding, while most PCs use ASCII Code. In this case, the presentation layer is required to complete the Conversion. From the previous introduction, we can see that the following 5 layers of the session l

received data to the application tier in the correct order.In addition, TCP does not explain the content of the byte stream. TCP does not know whether the transmitted data byte stream is binary or ASCII, EBCDIC, or other type of data. The interpretation of the byte stream is explained by the application layer of both sides of the TCP connection. This processing of byte streams is similar to the way the UNIX operating system handles files. The Unix ke

+ PostScript +visual+comments +langmap +printer nbsp +visualextra+conceal +libcall +profile +VIMINFO+CRYPTV +linebreak +python NB Sp +vreplace+cscope +lispindent -python3 NB Sp +wildignore+cursorbind NBSP;+LISTCMDS +quickfix NBS P +wildmenu+cursorshape +localmap +reltime +windo Ws+dialog_con_gui +lua +rightleft +writebackup+diff nbsp nbsp +menu +ruby +x11+dig Raphs +mksession +scrollbind NBSP;-XFONTSE

instead of the standard inputBs=size: Specifies the block size (both IBS and OBS)Ibs=size: Read a size byte at a timeObs=size: Write a size byte at a timeCbs=size: One conversion of size byteSkip=blocks: Ignores blocks of IBS-sized blocks from the beginningSeek=blocks: Ignores blocks of blocks obs size from the beginningCount=n: Copy only N recordsConv=conversion[conversion.] Convert the file with the specified parameters.Conversion parameters:ASCII conversion

/SRC Of=/path/to/destBs=#:block size, copying unit sizescount=#: How many BS do you copy?Of=file writes to the named file instead of to the standard outputIf=file read from the named file instead of the standard inputBS=SIZE Specifies the block size (both IBS and OBS)Ibs=size read size byte at a timeObs=size write a size byte at a timeCbs=size One conversion size a byteSkip=blocks ignores blocks of IBS-sized blocks from the beginningSeek=blocks ignoring blocks of obs size from the beginning of a

copying begins.Note: Usually only works when the output file is a disk or tape, that is, when backing up to disk or tape.7. Count=blocks: Copy only blocks blocks, the block size equals the number of bytes specified by IBS.8. Conv=conversion: Convert the file with the specified parameters.ASCII: convert EBCDIC to ASCIIEBCDIC: convert ASCII to EBCDICIBM: Convert ASCII to alternate EBCDICBlock: Converts each row to a CBS length, with less space paddingU

-499, v.35, v.24, RJ45, Ethernet, 802.3, 802.5, FDDI, NRZI, NRZ, B8zsData Link layer: Frame Relay, HDLC, PPP, IEEE 802.3/802.2, FDDI, ATM, IEEE 802.5/802.2Network layer: IP, IPX, AppleTalk DDPTransport layer: TCP, UDP, SPXSession layer: RPC, SQL, NFS, NetBIOS, names, AppleTalk, ASP, DECnet, SCPPresentation tiers: TIFF, GIF, JPEG, PICT, ASCII, EBCDIC, encryption, MPEG, MIDI, HTMLApplication layer: FTP, WWW, Telnet, NFS, SMTP, Gateway, SNMPAgreementA pr

acceptance of a session request (the device needs to know each other, either IP or Mac or host name). 6. Presentation layer: Ensures that the information sent by the application layer of one system can be read by the application layer of the other system. For example, a PC program communicates with another computer, where one computer uses an extended 210 binary interchange (EBCDIC), and the other uses the U.S. Information Interchange Standard Code (

form. Each row is preceded by a line number in the form of 16, followed by the form ASCII (or EBCDIC). Command-line option-r,-P does not work in this mode.-H (--help): Exits after displaying help information.-L N: only n characters are output.-R: Reverse operation: Convert the hexadecimal output of xxd back to the binary contents of the original file.This command is also commonly used to compare two binary files by comparing the hexadecimal copies of