-bash: have: command not found
-bash: have: command not found
-bash: have: command not found
-bash: have: command not found
-bash: have: command not found
-bash: have: command not found
-bash: have: command not found

bash --login -x

+ source /etc/locale.conf
++ LANG=en_US.UTF-8
+ for f in '/etc/bash_completion.d/*'
+ '[' -e /etc/bash_completion.d/grub ']'
+ source /etc/bash_completion.d/grub
+++ echo grub-set-default
+++ sed s,x,x,
++ __grub_set_default_program=grub-set-default
++ have grub-set-default
bash: have: command not found
++ unset __grub_set_default_program
+++ sed s,x,x,
+++ echo grub-reboot
++ __grub_reboot_program=grub-reboot
++ have grub-reboot
bash: have: command not found
++ unset __grub_reboot_program
+++ echo grub-editenv
+++ sed s,x,x,
++ __grub_editenv_program=grub-editenv
++ have grub-editenv
bash: have: command not found

chsh -s $(which zsh)

reboot

chsh -s $(which bash)

reboot

have: command not found
 have: command not found
 have: command not found
 have: command not found
 have: command not found
 have: command not found
 have: command not found
 have: command not found
 have: command not found
 have: command not found
 have: command not found
 have: command not found
 have: command not found
 have: command not found
 have: command not found