user1@labdi:~> echo "$HOME"
/home/user1
user1@labdi:~> echo "$PS1"
\[$(ppwd)\]\u@\h:\w>
user1@labdi:~> HOME = 'LAB-SO'
If 'HOME' is not a typo you can use command-not-found to lookup the package that contains it, like this:
    cnf HOME
user1@labdi:~> HOME = LAB-SO
If 'HOME' is not a typo you can use command-not-found to lookup the package that contains it, like this:
    cnf HOME
user1@labdi:~> HOME=LAB-SO
user1@labdi:/home/user1> "$HOME"
If 'LAB-SO' is not a typo you can use command-not-found to lookup the package that contains it, like this:
    cnf LAB-SO
user1@labdi:/home/user1> echo "$HOME"
LAB-SO
user1@labdi:/home/user1> ^C
user1@labdi:/home/user1>