shell 按列切割文件

#! /usr/bin/env bash

des_path=/home/zcy/temp
src_path=/mnt/cnic_data/SRA_AI_DATA/tools_files/myself
mouse_csv='GSM5594530_count.csv GSM5594497_count.csv'  
step=30000

for fname in  $mouse_csv
do
    echo $fname
    col_num=`awk -F ',' '{print NF; exit}' $src_path/$fname`
    for ((i=1; i<=$col_num; i+=$step))
    do
        end_post=$(($i+$step-1)) 
        new_name=${i}_${fname} 
        if [ $i != 1 ]
            then cut -d ',' -f 1,$i-$end_post  $src_path/$fname > $des_path/$new_name
        else  
            cut -d ',' -f $i-$end_post $src_path/$fname > $des_path/$new_name
        fi
        
    done
done

始终带上第一列