Truecrack on Kali don't know how to go about setting up my command

[BirdDad]

I have a Truecrypt container that has 30 characters in the password, I know what the first 13 are and I know what the last 11 are. I got an idea of what the six in the middle are but don't know for sure. How do I make it search only for the unknown characters? I got a pretty good idea of what they are but my attempts at guessing them have failed so far.
Is there a frontend that would make this easier?
Thanks

 

[BirdDad]

I know that the fist character is either a B or a b
second U or u or V or v
...so on.

 

[mv2devnull]

How do I make it search only for the unknown characters?

Does not compute. Websearch says that "TrueCrypt" is something that you don't want to forget the password of. If so, it would be surprising that such thing would provide a "search". Perhaps my Search-Fu is weak and you should explain what the "setting up command" entails?

for H in f{oo,u}{c,b}ar ; do echo ${H} ; done

 

[BirdDad]

I am talking about using masks for the known values and having it brute force the rest

 

[MrColin]

I would write a script to generate every possible combination by looped concatenation even though a command would do the same thing. Have it output to a file named wordlist.txt
Then

truecrack -t /path/to/tcvolume -w /path/to/wordlist.txt

that should do it.