bash脚本中的空echo是什么意思？

Question

I have this script:

if [ -n "$running_processes" ]
      then echo
      echo $service:
      echo
      echo "$running_processes"
      echo
      echo "lines: $(echo "$running_processes" | wc -l)"
      echo
      echo "=========="
fi

What does actually the echo with no string after that do?

Answer 1

From the info page:

`echo' writes each given STRING to standard output, with a space between each and a newline after the last one. Synopsis:

 echo [OPTION]... [STRING]... 

Since there are no strings that follow, the command will just print an empty line.