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Hi dev.devil.1983,
Here is a copy of the awk script with comments...
# Invoke the awk utility with the input field separator set to a comma (-F,)
# and a variable named sq that is set to a string...

Using awk:-
awk 'NR==FNR{A[$1];next}$1 in A' reference.txt data.txt
Using grep (no need to use cat):-
grep -f reference.txt data.txt

try:
sed 's/\([0-9][0-9][0-9][0-9]\)-\([0-9][0-9]\)-\([0-9][0-9]\)/\3-\2-\1/' infile

Unless you had backups of your files before you destroyed some of them, they are gone. To avoid the problem in the future, change the script suggested by rdrtx1 to something more like:
#!/bin/bash...

If you were willing to post details about your system and the tiny project for beginners that you need to complete, there would be a good chance that you would get a solution for free.

If you are...

Maybe you mean something more like:
#!/bin/ksh
time="${1:-1441678454803}"
sec=$((time % 60))
time=$((time / 60))
min=$((time % 60))
time=$((time / 60))
hrs=$((time % 24))
days=$((time / 24))...

Since you seem to be running as root and are getting an EPERM when trying to use chown, I would assume that the file img is from a filesystem that is either mounted:
read-only, or
from a remote...