Jtdylktuy

How can I change the text after the @-sign? I don't know what it means.

It says DESKTOP-HMEEP40.

This DESKTOP-HMEEP40 string you ask about is probably the hostname retrieved by h in $PS1. Ways to change it differ between OS-es/distros. With systemd you do it by invoking

hostnamectl set-hostname new_name_here

The whole root@… string is defined by PS1 shell variable:

PS1

Each time an interactive shell is ready to read a command, the value of this variable shall be subjected to parameter expansion and written to standard error. […]

_(source)

Run printf '%sn' "$PS1" to see what the variable is in your case. It probably contains some special strings like u, h. The relevant fragment of Bash Reference Manual is here. You can change PS1 like (almost) any other variable:

PS1="whatever "

To make a permanent change define the variable in your .bashrc file.

This search result may lead you to some interesting examples.

The PS1/prompt variable is what determines the format of shell prompt, and it's format and layout depends on the OS and shell being utilized. It's normally found in the shell's config file or the user's profile config.

• 
  Examples:
  
  
  
  
  • 
    Shell Config: ~/.bashrc for bash, ~/.cshrc for csh/tcsh, etc.
  
  
  • 
    User Profile: ~/.profile or /etc/profile, profile.ps1, etc.
    
    
    
    
  
  
  
  


• 
  Helpful links:
  
  
  
  
  • How to: Change / Setup bash custom prompt (PS1)
  
  
  • BASH Shell Change The Color of Shell Prompt on Linux or UNIX
  
  
  
  

The syntax of the PS1/prompt variable will vary with each OS:

• 
  

  BSD

  
  
  
  
  
  • 
    

    w/o color

    
    
    

    set prompt = "%N@%m:%~ %# "
    
    

    
    
  
  
  • 
    

    w/ color:

    
    
    

    set prompt = "[%{33[34m%}%N%{33[0m%}%{33[32m%}@%{33[0m%}%{33[34m%}%m%{33[0m%}] %{33[34m%}%~%{33[0m%}%{33[32m%}#%{33[0m%} "
    
    

    
    
  
  
  
  


• 
  

  OpenWrt:

  
  
  
  
  
  • 
    

    w/o color
    

    
    
    

    export PS1='u@OpenWrt w$ '
    
    

    
    
  
  
  • 
    

    w/ color
    

    
    
    

    export PS1='[[33[34m]u[33[0m][33[32m]@[33[0m][33[34m]OpenWrt[33[0m]] [33[34m]w[33[0m] [33[32m]$[33[0m] '
    
    

    
    
  
  
  
  


• 
  

  Ubuntu:

  
  
  
  
  
  • 
    

    w/o color
    

    
    
    

    PS1='[${debian_chroot:+($debian_chroot)}u@h]:w$ '
    
    

    
    
  
  
  • 
    

    w/ color
    

    
    
    

    PS1='[${debian_chroot:+($debian_chroot)}[33[38;5;039m]u[33[00m][33[38;5;154m]@[33[00m][33[38;5;039m]uvm[33[00m]] [33[38;5;039m]w[33[00m] [33[38;5;154m]$[33[00m]
    
    

    
    
  
  
  
  


• 
  

  Windows PowerShell:

  
  
  
  
  
  • 
    

    w/o color

    
    
    

     Function set-prompt {
    
         "$ESC[35mPS $($executionContext.SessionState.Path.CurrentLocation)$('$' * ($nestedPromptLevel + 1)) $ESC[0m"
    
     }
    
    

    
    
  
  
  • 
    

    w/ color

    
    
    

     Function set-prompt {
    
         Param (
    
             [Parameter(Position=0)]
    
             [ValidateSet("Default","Test")]
    
             $Action
    
         )
    
    
    
         switch ($Action) {
    
    
    
             "Default" {
    
                 Function global:prompt {
    
                     if (test-path variable:/PSDebugContext) { '[DBG]: ' }
    
                         write-host " "
    
                         write-host ("$ESC[48;2;40;40;40m$ESC[38;2;170;210;0m$(Get-Location) $ESC[0m $ESC[0m")
    
    
    
                     if ( $host.UI.RawUI.WindowTitle -match "Administrator" ) {
    
                         $Host.UI.RawUI.ForegroundColor = 'Red'
    
                         $(if ($nestedpromptlevel -ge 1) {
    
                             write-host ('PS $$ ') -ForegroundColor Red -NoNewLine
    
                         } else {
    
                             write-host ('PS $ ') -ForegroundColor Red -NoNewLine
    
                         })
    
                     } else {
    
                         $(if ($nestedpromptlevel -ge 1) {
    
                             write-host ('PS $$ ') -ForegroundColor Blue -NoNewLine
    
                         } else {
    
                             write-host ('PS $ ') -ForegroundColor Blue -NoNewLine
    
                         })
    
                     }
    
    
    
                     return " "
    
                 }
    
             }
    
         }
    
     }
    
    
    
     set-prompt Default