sum command in Linux with Examples

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



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