Function call in bash

#!/bin/ksh
# Function manual reference
# Array manual reference
# the util funciton (reverse of cat FILE) tac FILE does not work in OSX. Use tail -r FILE instead
function ProcessStatFile {

# Overwrite the file with nothing.
echo -n > $1

# Write the lines in reverse order
for j in {9..0}
do
echo ${lines[$j]} # the array is accessible since global. Does not need to be passed
done

}


FILES=./*.txt
for f in $FILES
do
echo "Processing $f file..."

#store the lines in an array
old_IFS=$IFS
IFS=$'\n'
lines=($(tail -r $f)) # array
IFS=$old_IFS

# Select the particular file ending with _statFile.txt


# Overwrite the file with nothing.
ProcessStatFile $f # the file name parameter is passed. Accessed as $1.

done