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for i in ./dir/*.lab
do
sed 's/$/\/Q:_0/' $i > tmp.tmp
mv tmp.tmp $i
done

If GNU cp is available (if you're on Linux for example) and if the filenames do not contain pathological characters (newlines or white spaces):

< list xargs cp -t target_dir --If the filenames...

With shell:

for f in *lab; do
[ -f "${f%.*}".wav ] || {
set -- ${f%${f#??????????????????}}*wav
[ -f "$1" ] && mv -- "$1" "${f%.*}".wav
}
doneIf you have more than one file...

It's not enough, there are tabs after number, so:
perl -pe '$j=sprintf "%05d",++$i;s/\d+\s/$j /' q6.txt

Try: perl -pe '$j=sprintf "%05d",++$i;s/\d+ "/$j "/' file

Basically you have three options:

1) Use the semi-colon separator:
sed 'command1;command2;...;commandn' input_file

2) Use the "-e" option:
sed -e 'command1' -e 'command2' ... -e 'commandn'...

Watch out

The Code provided by Michaelrozar does not change the indexing of the file so that
chp01_00001.wav
and
chp02_00001.wav

will be respectively moved

from chp01_00001.wav to...