Bash script to append date of creation to a text file.

text-renamer.sh

#!/bin/bash
cd /Users/markkoester/Desktop/
for f in *.txt ; do
    if [ -f "$f" ]
        then
            filedatetime=$(stat -f '%Sm' -t '%Y%m%d%H%M' "$f")
            filename=$(basename -- "$f")
            extension="${filename##*.}"
            filename="${filename%.*}"
            filename="${filename// /_}"
            mv "$f" ${filedatetime}_${filename}.${extension}
   fi
done