sum command in Linux is used to find checksum and count the blocks in a file. Basically, this command is used to show the checksum and block count for each specified file. When no file is specified then it will read the standard input.
Syntax:
sum [OPTION]... [FILE]...
Example: It will ask for the input of the file we want to calculate the checksum. In the following example, we are calculating the checksum for myfile.txt.
Options:
-
sum -r: This option will use BSD sum algorithm, use 1K blocks.
Example:
sum -r myfile.txt
-
sum -s: This option will use System V sum algorithm, use 512 bytes blocks.
Example:
sum -s myfile.txt
-
sum –help : This option displays the help text and exit.
sum --help
-
sum –version : This option will show the version information and exit.
sum --version
