Merge FPKM files

for ID in $(ls | grep -P -o '.*(?=(_Ballgown_Table))')
do
    cd ${ID}_Ballgown_Table
    echo process cutting ${ID}
    cat t_data.ctab | cut -f 12 | sed s/FPKM/${ID}/g > ../${ID}.fpkm
    if [ ! -f ../t_name.txt ];then
        cat t_data.ctab | cut -f 6 > ../t_name.txt
    fi
    pids="$pids $!"
    echo
    echo start waitting for finish cutting
    wait $pids
    cd ../
done

if [ ! -f finish.fpkm ];then
    paste `ls -tr *.fpkm` > only_all_id.fpkm
    paste t_name.txt only_all_id.fpkm > finish.fpkm
fi