General Commands Manual
NAME echo — write arguments to the standard output
utility writes any specified operands, separated by single blank (`` '') characters and followed by a newline (``\n'') character, to the standard output.
The following option is available:
Do not print the trailing newline character.
EXIT STATUS The echo utility exits 0 on success, and >0 if an error occurs.
STANDARDS The echo utility is expected to be IEEE Std 1003.2 (“POSIX.2”) compatible.