assign file names dynamically to match directory name

Question

#!/bin/bash
#script to loop through directories to merge fastq files
sourcedir=/path/to/source
destdir=/path/to/dest

for f in $sourcedir/*
do          
    zcat *R1*.fastq.gz | gzip > $destdir/R1.fastq.gz
    zcat *R2*.fastq.gz | gzip > $destdir/R2.fastq.gz      
done

Here there are about 30 sub-directories in the directory 'source'. Each sub-directory has certain .fastq.gz files that I want to merge into one .fastq.gz file and save the merged file to the destination directory. As you can see, I am creating files dynamically in my program. I want their names to match the directory name (essentially $f) in which fastq files are present. Is there a way to assign names to the files dynamically?

Answer 1

fbase=$(basename -- "$f")
zcat -- *$fbase*.fastq.gz | gzip > "$destdir/$fbase.fastq.gz"