如何在bash函数中打印换行符

#! /bin/sh
#
# Usage:
#
# f.sh <start_directory> <destination_directory> <prepare_directory> <remote_host_for_copy> <remote_user>
#
print_correct_syntax() {

 echo "f.sh <start_directory> <destination_directory> <prepare_directory> <remote_host_for_copy> <remote_user>"
 echo ""
 echo '<start_directory> needs to be a full path,<destination_directory> needs to be full path,<prepare_directory> has to be relative to start_directory path'
 echo ""

}
# ---- end of function definition ----

# check number of run-time arguments given to script

if [ $# != 5 ]
then
 echo Wrong Syntax! $(print_correct_syntax)
 exit;
fi
#---------------------------------------------------

函数(print_correct_syntax)中的echo空字符串命令(echo“”)似乎不起作用.相反,函数外的相同命令似乎工作正常.如何在bash函数中打印空换行？