In a Terminal, if I type beginning of any command by pressing tab I can see the rest of that command.
However this feature does not work with any words I type after
How can I complete command names even after I write
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OS X has not turned ON as many completion possibilities at the guys behind Ubuntu. In order to add autocompletion to sudo, you should simply add to the file
complete -cf sudo
The description of
complete and its options is briefly defined in the
bash built-in commands manual page (see
man bash). Although the -c and -f commands are not obviously detailed, one can find their description under the "-A action" explanation.
I did fix my problem by installing Bash Completion on Macports.
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It would help to know what shell you are using. This works for me in both bash and zsh. The completion in zsh is much better than bash.
One thing you could do is to type the command you want using tab completion, but before hitting return type
control-a to go to the beginning of the line and then type
sudo and hit return to execute the command.