
sha224sum:tldr:8fdb7
This command uses a Linux shell syntax and consists of two parts separated by the |
symbol, which is called a pipe.
The ${command}
part is a placeholder representing an actual command that should be executed. It could be any executable command or a combination of commands enclosed within curly braces ${}
. For example, if ${command}
is replaced with the command ls
, it would list the files and directories in the current directory.
The |
symbol is called a pipe, and it allows the output of the preceding command (${command}
) to be passed as input to the following command (sha224sum
).
The sha224sum
command is used to calculate the SHA-224 hash value of the input provided to it. It takes the input, performs a cryptographic hash function called SHA-224 on it, and produces a fixed-size output (224 bits or 28 bytes). This is often used for verifying the integrity of files or ensuring data integrity.
In summary, ${command} | sha224sum
is a command sequence that first executes ${command}
to generate some output (e.g., a file list), and then passes that output as input to the sha224sum
command, which calculates the SHA-224 hash value of that input.