How to make a variable be a sequence of file names from a folder in bash? And use two variables in for loop?

Question

I' am trying to make a simple bash script that run multiple times a program with several files at once, thought in make this with a for loop. that's why I thought in use a seq with the file names, I could set manually but I think is more fun learn how to do this in a more elegant way. Can someone help me? that's what Iam trying

folder=/user/folder/files_1.fi
folder2=/user/folder/files_2.fi
mypath=/path/to/files/

seq1= folder{??}
seq2= folder2{??}

for x,y in seq1 seq2
output= ${x:0:5}

do

program options -1 $mypath/$seq1 -2 $mypath/$seq2 -o $output



done

Answer 1

I could figure out a way to solve my own problem, and I'am posting here for other looking for the same or similar problem.

Thank you anyway.

$ cat script.sh
#!/bin/bash

seq1=(/path/to/files/*._1.fq)
seq2=(/path/to/files/*._2.fq)

for ((i=0;i<=${#seq1[@]};i++)); do

 output=$(echo ${seq1[$i]} | awk '{print substr ($0, 28, 8)}')
program options -1 ${seq1[$i]} -2 ${seq2[$i]} -o $output
done