Extracting a date from a file name

Whenever you have a shell script that handles a file with a date (or some other information) and you want to use that, you can do the following:

#!/bin/sh

# obviously, my file is a csv-file, and I'm stripping the extension and the path.
# the file is called somefile-20160308.csv
FILE=`basename /somepath/somefile* .csv`

# the following line extracts the date
DATE=`expr "$FILE" : ".........\(........\)"`

echo $FILE
echo $DATE

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