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NUMBER=$1
if [ $# -ne 1 ] # Verify that there is only one argument on the command line
then
echo "Error. Can only use 0 or 1 arguments."
echo "Usage: maxlines.sh [directory]."
exit 1
fi
flag=1...

Cron standard output and error output is mailed to your user mailbox. So please check mail command. It is possible to redefine it.

check this
awk -v datestamp=$(date +'%D') 'NR==9 { printf datestamp } { print $0 } ' abc.log

Small fix
awk ' /STARTED/ && prev=="" { prev=$1; next } /STARTED/ { print $1-prev} '

Use "ll -d" to check directory and not list files inside