We will look at the line using unset to remove a value from a key. To do that, we use the unset keyword. For example, the following command deletes the current values from the hostnames and domainkeys keys. Notice the use of wildcard characters. The * is replaced by the numeric values for hostnames and domainkeys. In this example, all hosts in the local network have been removed from the hostnames and domainkeys files. To use this feature, the host that the command runs on must have either the SSH_HOSTNAME_VAR and/or SSH_DOMAINKEYS_VAR environment variables set. The following example shows how to create the SSH_HOSTNAME_VAR and SSH_DOMAINKEYS_VAR variables. The SSH_HOSTNAME_VAR variable is used to declare the name of the host that you are running the command on. The SSH_DOMAINKEYS_VAR variable is used to declare the name of the location that the ssh_keygen command is run from. EXAMPLE 1: Create the SSH_HOSTNAME_VAR and SSH_DOMAINKEYS_VAR variables SET:
This example shows how to generate RSA keys for multiple users. To create this RSA key, all that is needed is the name of the directory you want to generate the keys in, the name of the user, the file name of the key, and the name of the key. This example creates three RSA keys in a directory named testkeys. In this example, we create three keys and call them TestUser, TestUser2, and TestUser3. In order to generate the keys, the key files must be owned by the user that will be generating the keys. Therefore, you must use the mkdir command to create the directory. The following example shows how to generate RSA keys for multiple users. The create the keys, user, file name, and key name are passed as parameters to the ssh-keygen command. Here is a list of the parameters for generating RSA keys. –d Directory in which to create the keys: -i Input file name: -f Filename of the key you want to generate: -m Name of the key that will be created: –t Type of the key to create: –e Key passphrase: –e –u User name: –o Directory where keys are created: EXAMPLE 2: Create RSA keys to be used by multiple users be359ba680
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