GNU Parallel Bug Reports Tcsh compatibility

[parallel-bug]

Hello Ole!

We are starting to use parallel in our lab, but we're getting error
messages because we use tcsh by default, and 'PARALLEL_PID=1234 \;
export PARALLEL_PID \; PARALLEL_SEQ=1 \; export PARALLEL_SEQ \;' (line
2904) is intended for bash.

Our first patch just did this:
            my $parallel_env =
                'setenv PARALLEL_SEQ $PARALLEL_SEQ\;'.
                'setenv PARALLEL_PID $PARALLEL_PID\;'.
                'PARALLEL_SEQ=$PARALLEL_SEQ\;export PARALLEL_SEQ\;'.
                'PARALLEL_PID=$PARALLEL_PID\;export PARALLEL_PID\;';
It works, but now generates error messages in both shells.

I attempted to insert some variation of the following code:
  [ -z "$tcsh" ] && export PARALLEL_PID=$PARALLEL_PID || setenv \
  PARALLEL_PID $PARALLEL_PID
but getting it to work has escaped me, probably due to quoting issues
that I don't fully understand.

It then occurred to me that the best solution is to use the 'env'
command, like so:
  env PARALLEL_PID=$PARALLEL_PID PARALLEL_SEQ=$PARALLEL_SEQ .....
since it'll work with any shell and needs less quoting than even the
original code!

I hope this helps you create an even more universal version of
parallel, a really cool tool!

-- 
P Fudd -- address@hidden