Bash script to update file timestamps by filename

```bash

Find files within the current directory which match the filename pattern of "YYYYMMDD..."

and update their modified timestamp to the filename

Example, a file named "20210405_test_file.jpg" will have its timestamp

set to 2021 April 5.

find . -type f -regex '.\/[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9].' | while read i; do D=$(echo "$i" | sed 's:./([0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]).:\1:') touch "$i" -t "${D}0000" done ```