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With bash, I can complete a command with TAB. Normally, it should also complete the command line switches: e.g. when I typed:
java -
it should show me the possibilities. It does not. How can I enable this preview?
See also Surprise! the shell suggests command line switches
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Bash completion is a functionality through which Bash helps users type their commands more quickly and easily. It does this by presenting possible options when users press the Tab key while typing a command.
The programmable completion feature in Bash permits typing a partial command, then pressing the [Tab] key to auto-complete the command sequence. [1] If multiple completions are possible, then [Tab] lists them all. Let's see how it works. Tab completion also works for variables and path names.
You need to have bash_completion installed and then just add . /etc/bash_completion to your .bashrc.
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Depending on what Linux flavor you're using, you may want to add a package. For Fedora and related distributions, you need to add the separate package bash-completion to get this to work. I wouldn't be surprised if other distributions had this packaged as an optional 2nd package that you need to add in addition to the bash package.
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