echo - write arguments to standard output echo [string ...] The
echo utility writes its arguments to standard output, followed
by a <newline>. If there are no arguments, only the <newline> is
written. The echo utility shall not recognize the "--" argument
in the manner specified by Guideline 10 of the Base Definitions
volume of IEEE Std 1003.1-2001, Section 12.2, Utility Syntax
Guidelines; "--" shall be recognized as a string operand.
Implementations shall not support any options. The following
operands shall be supported: - A string to be written to
standard output. If the first operand is -n, or if any of the
operands contain a backslash ( '\' ) character, the results are
implementation-defined. [XSI] On XSI-conformant systems, if the
first operand is -n, it shall be treated as a string, not an
option. The following character sequences shall be recognized on
XSI-conformant systems within any of the arguments: - Write an
<alert>. - Write a <backspace>. - Suppress the <newline> that
otherwise follows the fina