How to use the cksum command in Linux
This article will explain in detail how to use the cksum command in Linux. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.
The common Linux command cksum is to check whether the CRC of the file is correct and to ensure that the file is not corrupted during transfer from one system to another. This method requires that the checksum is calculated in the source system and again in the destination system, and the two numbers are compared. If the checksum is equal, the file is considered to be transmitted correctly.
Cksum checks whether the CRC of the file is correct
Note: CRC refers to a method of troubleshooting, that is, cyclic redundancy check.
After the specified file is verified by the cksum command, the verification result is returned for the user to check whether the file is correct. If no file name is specified or given a file name of "-", the cksum command reads data from the standard input device.
Syntax cksum (options) (parameters) options-- help: online help;-- version: display version information. Parameter file: specifies the version information to calculate the check.
The instance uses the cksum command to calculate the integrity of the file "testfile1". Enter the following command:
Cksum testfile1 # performs CRC verification on the specified file. After the above command is executed, relevant information such as the check code will be output. The specific output information is as follows:
In the output information above the 1263453430 78 testfile1 # output information, "1263453430" indicates the check code and "78" indicates the number of bytes.
Note: if any character in the file is modified, the value of the calculated CRC check code will be changed.
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