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Bash auto completion

installed

sudo apt update
sudo apt install bash-completion

Test

cat /etc/profile.d/bash_completion.sh

Load

## source it from ~/.bashrc or ~/.bash_profile ##
echo "source /etc/profile.d/bash_completion.sh" >> ~/.bashrc
## Another example Check and load it from ~/.bashrc or ~/.bash_profile ##
grep -wq '^source /etc/profile.d/bash_completion.sh' ~/.bashrc || echo 'source /etc/profile.d/bash_completion.sh'>>~/.bashrc

source /etc/profile.d/bash_completion.sh

Change Bash

Find the current shell

echo $SHELL

Change the shell

chsh -s /bin/bash
chsh -s /bin/zsh

Reference