echo [ -neE ] [ arg ... ]
       Write  each  arg on the standard output, with a space separating
       each one.  If the -n flag is not present, print a newline at the
       end.  echo recognizes the following escape sequences:

       \a     bell character
       \b     backspace
       \c     suppress subsequent characters and final newline
       \e     escape
       \f     form feed
       \n     linefeed (newline)
       \r     carriage return
       \t     horizontal tab
       \v     vertical tab
       \\     backslash
       \0NNN  character code in octal
       \xNN   character code in hexadecimal
       \uNNNN unicode character code in hexadecimal
       \UNNNNNNNN
              unicode character code in hexadecimal

       The  -E  flag,  or  the  BSD_ECHO option, can be used to disable
       these escape sequences.  In the latter case, -e flag can be used
       to enable them.

       Note that for standards compliance a double dash does not termi-
       nate option processing; instead, it is printed  directly.   How-
       ever,  a  single  dash  does terminate option processing, so the
       first dash, possibly following  options,  is  not  printed,  but
       everything  following  it is printed as an argument.  The single
       dash behaviour is different from other shells.  For a more  por-
       table  way of printing text, see printf, and for a more control-
       lable way of printing text within zsh, see print.
