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Bash tab completion adds extra space after the first completion which stops further completion if the compeletion target is a file in multi-level folders.
For example, I have a file in the path ~/Documents/foo/bar.txt, and I want to list it. I face the following problem, when input
a@b:~$ls Docu <TAB> I get
a@b:~$ls Documents |(<-this is the cursor, so there is an extra space afer Documents) So I cannot further tab complete. I have to backspace to delete the extra space.
Normally I want to get:
a@b:~$ls Docu <TAB> a@b:~$ls Documents/ <TAB> a@b:~$ls Documents/foo/ <TAB> a@b:~$ls Documents/foo/bar.txt 
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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.
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.
Command-line completion (also tab completion) is a common feature of command-line interpreters, in which the program automatically fills in partially typed commands.
Just for the record: There is also a bug in the adobereader-enu (acroread) package that breaks bash completion. In this case you can just delete the symlink:
rm /etc/bash_completion.d/acroread.sh See also: https://bugs.launchpad.net/ubuntu/+source/acroread/+bug/769866
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