If the checksum of the file1 file is 32830, the checksum of the file2 file is 32481, and the file1 file contains one block, and the file2 contains four blocks, the sum command displays: 32830 1 file1 To display the checksum of, and the number of 1024-byte blocks in, the file1 and file2 files, enter: sum file1 file2 This command returns the following exit values: 0 Note: The default is no longer the word-by-word computation algorithm it is the BSD 4.3 default algorithm. Using the -r flag is the same as using no options. Uses a byte-by-byte algorithm to compute the checksum. For testing and debugging sometimes it is necessary. At the bit level, there are four possibilities, 0 0 0 0 1 1 1 0 1 1 1 0 Non-binary inputs are converted into their binary equivalents using gmpinit. Firmware for microcontrollers are often stored in Intel HEX files. The sum command with the -o flag is compatible with the Version 2 sum command in terms of the checksum, but not the number of blocks. The form calculates the bitwise exclusive or using the function gmpxor. Uses the word-by-word algorithm to compute the checksum. If the input file is not a binary file, the checksum includes header information. However the raw underlying bits of the data are used to determine the MD5. Flags -iĪllows the user to compute the checksum without including header information, if the input file is a binary file. In its simplest form, a checksum is created by calculating the binary values in a packet or other block of data using some algorithm and storing the results with the data.The sum command is generally used to determine if a file that has been copied or communicated over transmission lines is an exact copy of the original. Most checksum algorithms treat the data file as a list of unsigned bytes and then sum the values of those bytes (this type of algorithm can be performed by. The checksum and number of 1024-byte blocks are written to standard output.
If no files are named, the standard input is read.
If no options are specified, a byte-by-byte algorithm, such as the BSD 4.3 default algorithm, is used. The sum command reads the file specified by the File parameter and calculates a checksum and the number of 1024-byte blocks in that file. AIX Version 4.3 Commands Reference, Volume 5ĭisplays the checksum and block count of a file.
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