Bash/bash-completion
bash-completion erweitert die Vervollständigung von Befehlszeilen mit Hilfe der TAB-Taste
Installation
# apt install bash-completion
Aktivierung
Aktivierung für alle Benutzer
/etc/bash.bashrc
if ! shopt -oq posix; then if [ -f /usr/share/bash-completion/bash_completion ]; then . /usr/share/bash-completion/bash_completion elif [ -f /etc/bash_completion ]; then . /etc/bash_completion fi fi
Aktivierung pro Benutzer
~/.bashrc
if ! shopt -oq posix; then if [ -f /usr/share/bash-completion/bash_completion ]; then . /usr/share/bash-completion/bash_completion elif [ -f /etc/bash_completion ]; then . /etc/bash_completion fi fi
To try it without logging out and back in, run:
$ . ~/.bashrc
Funktionsweise
- the . in front of /etc/bash_completion does not refer to the current directory, since it has spaces around it.
- It instead makes the contents of the given file be evaluated in the currently running shell, instead of being executed in a new subshell. It is standardized here.
- In Bash, this . can be replaced by the command source, but this is not standardized by POSIX and is less portable so I tend to steer people away from using it.
- In this case, since it is specifically a program for extending bash, rather than something that needs to work in a bourne shell or ksh, you can feel free to substitute source for readability.
- Incidentally, this behavior (not opening a sub-shell) is similar to the way DOS/Windows .BAT scripts work normally, changing the state of the shell they are run in.
- This is why if you cd into a different path in a shell script, you won't be in that path when the script exits like you would be in a .BAT.
Anwendung
- Then try to use tab-completion
- That dot and space at the beginning (.) is the same as using the source keyword in bash, but is more portable.
- If you want it to work when su'd into the root account, do the same thing in root's home directory (typically /root).
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