How to echo message when file is empty.

Shell Programming and Scripting
1

If a file is empty then it must print the message "no data found"

eg:

 if [cat $FILE_NAME = empty ] then
      echo "no data found"

your help is really appreciated.

2

There is a test option for this:

if [ ! -s FILE ]; then
  echo "No data found..."
fi
3

If you want to test for empty file (without any non printable characters or white spaces):

[ -s afile ] || echo empty

Otherwise:

[ -n "$(<afile)" ] || echo empty
4

Thanks for the help it worked

if [ ! -s FILE ]; then echo "No data found..." fi