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According to the useless use of cat web page that you refer to:

"Briefly, here's the collected wisdom on using cat: The purpose of cat is to concatenate (or "catenate") files. If it's only one...

echo " 1" | awk '{print $1}'

awk automatically strips the leading spaces when determining arguments.

This is your version, cleaned up so it works, along with test results (test file shown below).
cat test | awk -F"+" '
{
if ( $0 ~ /^$/ )
{
}
else
{
if ( $0 ~ /^[0-9+-]+$/...

Technically, scp does create directories if you specify the -r option but that means you need to copy the entire directory and not just a single file:

-r Recursively copy entire...

Since you are using cron and running the script every 30 minutes, if you don't mind keeping an extra copy of your log file, you can do this instead. The cp is necessary to ensure that your next run...

find ${StartingDir} -name "*.txt" | grep -e "/DOC/" -e "/DOCS/" |
while read FullPath
do
mv ${FullPath} ${FullPath}Old
done

The problem is that you are not eliminating the heading printed by the df command.

Execution yields:
df -k /home | grep % | awk '{print $5}' | sed 's/%//g'
Use
1

Change:
df -k /home | grep...