The command line prefix will disappear when you install some package e.g. Anaconda. There is a way to restore and customize the prefix.
Edit the .bashrc file and append these text:
export PS='[\u]\#' #\u – Username
export PS='[\h]\#' #\h – Hostname
export PS='[\w]\#' #\w – Full path of the current working directory
You can customize the text :
export PS='[\u@\w]\#'
And [root@localhost opt]# can be appeared in your bash.
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