Shell Programming and Scripting

TestKLFH
TEstLKHU
HESTLJHG

ABCDEFG.log:TestKLFH
ABCDEFG.log:TEstLKHU
ABCDEFG.log:HESTLJHG

cd XYZ
for i in *.log
do
        if [ -f "$i" ]; then
                sed -i "s/^/$i:/" "$i"
        fi
done

DIR="/home/abc/xyz"

file_count=$(ls $DIR |wc -l) # Get the count of files present in the DIR

if [[ $file_count -eq 1 ]] # if count equals 1 then,
then
	
	file_name=$(ls $DIR) # store the file name
	sed "s/^/$file_name: /" ${DIR}/${file_name} > ${DIR}/output.txt # append the required TEXT and store it in output.txt 

	if [[ $? -eq 0 ]] # if the above command is success then move
	then
		mv ${DIR}/output.txt ${DIR}/${file_name}
	else
		echo "Command failed to update file"
	fi
fi

$ [ $(ls -1 /dir/path/XYZ | wc -l) -eq 1 ] && awk '{print FILENAME":"$0}' ABCDEF.log > outfile && mv outfile ABCDEF.log