如何将bashfor循环脚本中的两个变量赋值为对？

Question

困难的bash脚本与多少成功的for-循环

#!bin/bash
 
HG19BAM=/3568_5891_5871/3568-NRSA-output-M1chip/3568/3568-hg19-bam 

BW=/3568_5891_5871/3568-NRSA-output-M1chip/3568/3568-hg19-bam/3568-BIGWIG_RPM_tools

source /Users/user/opt/anaconda3/etc/profile.d/conda.sh

VAR1="1 2 3 4 5 6 7 8"

VAR2="39.179 27.394 27.623 32.775 25.2577 30.627 27.6229 30.802"

conda activate Bedtools 
 
for i in $VAR1; do for j in $VAR2
do      
echo "Creating minus strand ${i} scaling to ${j}"

bedtools genomecov -ibam ../3568-MB-${i}.hg19.sorted.F4q10.BLfiltered.bam -bg -scale ${j} -strand - -5 > 3568-${i}.strandminus.5.normRPM.bedGraph

sort -k1,1 -k2,2n 3568-${i}.strandminus.5.normRPM.bedGraph > 3568-${i}.strandminus.5.normRPM.sorted.bedGraph

bedGraphToBigWig 3568-${i}.strandminus.5.normRPM.sorted.bedGraph /Users/user/bin/homer/data/genomes/hg19/chrom.sizes \
     3568-${i}.strandminus.5.normRPM.sorted.bw

echo "Creating positive strand ${i} scaling to ${j}"

bedtools genomecov -ibam ../3568-MB-${i}.hg19.sorted.F4q10.BLfiltered.bam -bg -scale ${j} -strand + -5 > 3568-${i}.strandplus.5.normRPM.bedGraph

sort -k1,1 -k2,2n 3568-${i}.strandplus.5.normRPM.bedGraph > 3568-${i}.strandplus.5.normRPM.sorted.bedGraph

bedGraphToBigWig 3568-${i}.strandplus.5.normRPM.sorted.bedGraph /Users/user/bin/homer/data/genomes/hg19/chrom.sizes \
     3568-${i}.strandplus.5.normRPM.sorted.bw

done
done

conda deactivate 

输出：

bash /Users/user/Library/Mobile\ Documents/com\~apple\~TextEdit/Documents/3568-bigiwggenomecov.sh
Creating minus strand 1 scaling to 39.179
Creating positive strand 1 scaling to 39.179
Creating minus strand 1 scaling to 27.394

我如何只对1与39.179和2与27.394等？

如何更改for循环，以避免将每个$VAR1与每个$VAR2进行比较？

Answer 1

如果只需要对，则不需要嵌套循环。其中一种方法是将VAR*转换为数组，然后可以迭代i (每个数组中有许多元素)，并在每个步骤中使用VAR1i和VAR2i。

所以你得弄清楚：

• 如何将输入字符串转换为数组
• 如何同时在它们上迭代

希望这给我们一个正确的思考方向。