问Bash for循环在第一次迭代后停止

EN

declare -a CT
CT=(2 0 -1 -2)
len=${#CT[@]}

for ((i=0;i<len;i++)); do
    a=${CT[$i]}
    b=${CT[$((i+1))]}
    input=${job_type}_${a}_${b}

    WorkDir=/scratch/$USER/${input}.${JOB_ID} #Directory in a cluster
    mkdir -p $WorkDir;
    cd $WorkDir;      #Go to cluster 
    ...
    Code that creates ${filename}.cpki file using a and b
    ...

    $MPIRUN -np $NSLOTS $CP2K -i "${filename}.cpki"> "${filename}.cpko"

done