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Some additional explanation might be helpful. The awk program is going to process the first file all the way through and then it will process the second file. NR is the total number of records seen...

awk 'FNR==NR {f1[$0];next} !($1 in f1)' file1 file2

it should output to the screen. You can redirect that to a file of your choice:

awk 'FNR==NR {f1[$0];next} !($1 in f1)' file1 file2 > myOutputFile

Try it out. Even or odd in this sense has nothing to do with the day of the month. It is the number of weeks since a startpoint.

And yes, change Monday to Friday if you want it to run on Fridays.

chmod -R 660 /path/to/dir will change the permissions of all folders and files inside the folder '/path/to/dir', including /path/to/dir itself.

To do just folders: find /path/to/dir -type d -exec...

One way is to use egrep and count the results.
The escaped $ (\$) means "end of line" in case the program outputs numbers above zero with leading zeros.

found_count=`egrep "Number of agencies...