keyctl:tldr:750a3

This command is a combination of the echo and keyctl commands. Let's break it down step by step:

1. echo -n ${key_value}: In this part, the echo command is used to print a value followed by a pipe (|). The -n flag is used to prevent the trailing newline character from being added to the output. ${key_value} represents a variable that holds the value to be printed.

2. | (pipe): The pipe symbol | is used to redirect the output of the previous command (echo) to the next command (keyctl padd).

3. keyctl padd ${type_keyring} ${key_name} ${target_keyring}: This part is the command keyctl padd followed by various arguments. The keyctl command is used for key management operations in Linux. Here's what each argument represents:

   • ${type_keyring}: This is a variable that specifies the type of keyring where the key will be added.
   • ${key_name}: This represents the name of the key to be added.
   • ${target_keyring}: This is the keyring where the new key will be added.

By combining the echo and keyctl commands with the pipe (|) operator, the command first echoes the ${key_value} without a trailing newline character, and then pipes it as input to the keyctl padd command, which adds a new key with the specified name to a specific keyring.