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I have a question about how to move files to specific folders according to their key words. Say, I have a bunch of files: R01.fastq.gz R02.fastq.gz R03.fastq.gz R04.fastq.gz ... and I have a buch of folder: data01 data02 data03 data04 ... I want to put R01.fastq.gz to data01, R02.fastq.gz to data02, R03.fastq.gz to data03, R04.fastq.gz to data04 ... So how to use a loop script to do it? Thanks a lot!

  • What have you tried so far? – bu5hman Nov 4 '19 at 18:03
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# use brace expansion to create a list 00,01,02,[...] 98,99
for i in {0..9}{0..9} ; do
  # defining file and directory as vars as we will use them a couple of times each
  F=R$i.fastq.gz
  D=data$i/
  # if F does not exist, or is not a file, do nothing
  [ -f $F ] || continue
  # create any needed directories and move files if created OK (mkdir
  # will fail if D exists but is not a directory)
  mkdir -p $D && mv $F $D
done
  • Thank you very much, so what does '[ -f $F ] || continue' mean? Could you explain this part a little bit? – Jiang Xu Nov 4 '19 at 18:41
  • It makes it skip the iteration of the loop when F doesn’t exist as a file. – bxm Nov 4 '19 at 19:02
  • It could otherwise have been written: ! test -f $F && continue – bxm Nov 4 '19 at 19:15

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