Shell腳本：while循環內的for循環

Question

我有32個文件（命名方式相同，唯一區別是下面寫的$ sample數目），我想分成4個文件夾。我正在嘗試使用以下腳本來完成這項工作，但該腳本無法正常工作，請有人幫助我使用以下shell腳本？ - 謝謝

#!/bin/bash 

max=8 #8 files in each sub folder 
numberFolder=4 
sample=0 

while ($numberFolder > 1) #skip the current folder, as 8 files will remain 
do 
    for (i=1; i<9; i++) 
    do 
    $sample= $i * $numberFolder # this distinguish one sample file from another 
    echo "tophat_"$sample"_ACTTGA_L003_R1_001" //just an echo test, if works, will replace it with "cp". 

    done 
$numberFolder-- 
end 

Answer 1

您需要正確使用數學上下文 - (()) - 。

#!/bin/bash 

max=8 
numberFolder=4 
sample=0 

while ((numberFolder > 1)); do # math operations need to be in a math context 
    for ((i=1; i<9; i++)); do # two (()), not (). 
    ((sample = i * numberFolder)) 
    echo "tophat_${sample}_ACTTGA_L003_R1_001" # don't unquote before the expansion 
    done 
    ((numberFolder--)) # math operations need to be inside a math context 
done