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 terminate
       option processing; instead, it is printed directly.  However, a sin-
       gle dash does terminate option processing, so the first dash, possi-
       bly 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 portable way of  printing  text,  see
       printf, and for a more controllable way of printing text within zsh,
       see print.
