How can I move all files matching a pattern into a new folder? I have files like these : - REPORT_100_COMPLETED.csv - REPORT_100_FAILED.csv - REPORT_101_COMPLETED.csv - REPORT_101_FAILED.csv - REPORT_102_COMPLETED.csv - REPORT_102_FAILED.csv I want all of them to be put inside subfolder according to the related id : 100 | REPORT_100_COMPLETED.csv | REPORT_100_FAILED.csv 101 | REPORT_101_COMPLETED.csv | REPORT_101_FAILED.csv 102 | REPORT_102_COMPLETED.csv | REPORT_102_FAILED.csv and so on, anyone can help? Thank you in advance!

for i in REPORT_*_*.csv ;do
dir=$(cut -d'_' -f2 <<<$i)
mkdir -p $dir && mv $i $dir/
done