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According to How to reset the Expert mode password in Gaia OS  it is used to reset the Expert mode password:

1. Connect to the CLI on Gaia machine (over SSH or console).

2. Log in to CLISH as an adminRole user (a user with monitorRole does not have sufficient permissions).

3. Find the hash of the CLISH password:

   HostName:0> show configuration

   One line near the end will look similar to this:
   set user <USERNAME> password-hash $1$vCbd0F3d$FjawgvrKBN.4Ed27hTPpB0

4. Set the hash of the CLISH password to be the hash of the Expert mode password

   HostName:0> set expert-password-hash <HASH_of_CLISH_PASSWORD>
   (in this case: set expert-password-hash $1$vCbd0F3d$FjawgvrKBN.4Ed27hTPpB0 )
5. Save the configuration:
   HostName:0> save config
6. Set new Expert mode password:
   HostName:0> set expert-password
7. Save the configuration
   HostName:0> save config
   

So you don't use it AFTER you have set a password for Expert mode.