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keyctl:tldr:750a3
This command is a combination of the echo and keyctl commands. Let's break it down step by step:
-
echo -n ${key_value}
: In this part, theecho
command is used to print a value followed by a pipe (|
). The-n
flag is used to prevent the trailing newline character from being added to the output.${key_value}
represents a variable that holds the value to be printed. -
|
(pipe): The pipe symbol|
is used to redirect the output of the previous command (echo
) to the next command (keyctl padd
). -
keyctl padd ${type_keyring} ${key_name} ${target_keyring}
: This part is the commandkeyctl padd
followed by various arguments. Thekeyctl
command is used for key management operations in Linux. Here's what each argument represents:${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.