Bash completion on Linux/Mac

1. Debian 9

By default, debian 9 stretch does not have completion as ubuntu distro, we will need it in some specific cases and can speed up daily operation tasks

• Autocomplete / hint when pressing tab

• Apply for all user/profile

apt install bash-completion

# In file /etc/profile
if [ -f /etc/bash_completion ]; then
 . /etc/bash_completion
fi

2. Mac (with wireguard vpn)

bash --version
GNU bash, version 5.0.7(1)-release (x86_64-apple-darwin18.5.0)

brew install bash-completion
brew reinstall bash-completion

# In file ~/.bash_profile

[[ ${BASH_VERSINFO[0]} -ge 4 ]] || return 0
if [ -f $(brew --prefix)/etc/bash_completion ]; then
    . $(brew --prefix)/etc/bash_completion
fi

Reference

1. https://lists.zx2c4.com/pipermail/wireguard/2018-October/003418.html

2. https://github.com/Homebrew/homebrew-core/issues/32535