Bash tab complete with non-first token in command substitution $(...) throws error

Question

Using tab completion on the first command in $(...)

cat $(w

When I hit tab I get potential completions as usual.

$ cat $(w
w                   wc                  which               wicd-client         wofm2opl            wpa_supplicant

However, in non-first positions bash shows a strange error

$ cat $(which w

shows

$ cat $(which w-bash: unexpected EOF while looking for matching `)'
-bash: syntax error: unexpected end of file

sh command substitution syntax shows the same expected behavior for the first position but not subsequent positions

$ cat `w
w                   wc                  which               wicd-client         wofm2opl            wpa_supplicant

$ cat `which w

has no autocompletions at all.

Answer 1

It's obvious , it is looking for a closing ) , You can't hit tab after cat $(which w , because w has to be completed by yourself , by typing some arugment name , bash completion is not for argument completion I guess . it is for the command completion.

try this behaviour after installing this bash completion , this may complete most of the things for you.

    yum install bash-completion 
    source /etc/bash_completion