Help running an example (Calling Bash functions) from the manual

[Thompson, Matt (GSFC-610.1)[SCIENCE SYSTEMS AND APPLICATIONS INC]]

Parallel List,

I'm a newbie to GNU parallel, but I decided today to try and parallelize 
a Bash script I have but I just kept getting stymied. So, I thought I'd 
just try the example from the manual:

http://www.gnu.org/software/parallel/man.html#example__calling_bash_functions

However, I can't seem to run that! To wit I placed that example in a 
file called "tpar.bash" and just tried to run it, but it doesn't work:

> (231) $ parallel --version
> GNU parallel 20140522
> Copyright (C) 2007,2008,2009,2010,2011,2012,2013,2014 Ole Tange and Free 
> Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> GNU parallel comes with no warranty.
>
> Web site: http://www.gnu.org/software/parallel
>
> When using programs that use GNU Parallel to process data for publication 
> please cite:
>
> O. Tange (2011): GNU Parallel - The Command-Line Power Tool,
> ;login: The USENIX Magazine, February 2011:42-47.

> (232) $ bash --version
> GNU bash, version 4.1.2(1)-release (x86_64-redhat-linux-gnu)
> Copyright (C) 2009 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
>
> This is free software; you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.

> (233) $ cat tpar.bash
> #!/bin/bash
>
> doit() {
>   echo Doing it for $1
>   sleep 2
>   echo Done with $1
> }
> export -f doit
> parallel doit ::: 1 2 3
> doubleit() {
>   echo Doing it for $1 $2
>   sleep 2
>   echo Done with $1 $2
> }
> export -f doubleit
> parallel doubleit ::: 1 2 3 ::: a b

> (234) $ bash tpar.bash
> doit: Command not found.
> doit: Command not found.
> doit: Command not found.
> doubleit: Command not found.
> doubleit: Command not found.
> doubleit: Command not found.
> doubleit: Command not found.
> doubleit: Command not found.
> doubleit: Command not found.

Now, from the look of the bash output, parallel seems to be doing its 
job, right? So I'm guessing that makes this a Bash issue and not a 
parallel issue?

I thought I'd ask here first since it was in the parallel manual. But 
I'll gladly ask this instead on the Bash list if you think that would be 
better.

Matt

--
Matt Thompson          SSAI, Sr Software Test Engr
NASA GSFC, Global Modeling and Assimilation Office
Code 610.1, 8800 Greenbelt Rd, Greenbelt, MD 20771
Phone: 301-614-6712              Fax: 301-614-6246