Split

scp=$data/wav.scp

# prepare split_scps
split_scps=""
for n in $(seq $nj); do
    split_scps="$split_scps $logdir/wav_${name}.$n.scp"
done

# split scp
utils/split_scp.pl $scp $split_scps || exit 1;

tip: split_scps="1.scp 2.scp"

Concatenate

# concatenate the .scp files together.
for n in $(seq $nj); do
  cat $mfccdir/raw_mfcc_$name.$n.scp || exit 1;
done > $data/feats.scp || exit 1