jinxi@jinxi-kde:~$ ls /
bin   cdrom  etc   initrd.img      lib    lib64       media  proc  run   snap  sys  usr  vmlinuz
boot  dev    home  initrd.img.old  lib32  lost+found  mnt    root  sbin  srv   tmp  var
jinxi@jinxi-kde:~$ declare -p PS1 PROMPT_COMMAND
declare -- PS1="\${debian_chroot:+(\$debian_chroot)}\\u@\\h:\\w\\\$ "
bash: declare: PROMPT_COMMAND: not found
jinxi@jinxi-kde