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Man Pages
ECHO(1) FreeBSD General Commands Manual ECHO(1)

echo
write arguments to the standard output

echo [
-n
] [
string ...
]

The echo 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.
The end-of-options marker -- is not recognized and written literally.
The newline may also be suppressed by appending ‘\c’ to the end of the string, as is done by iBCS2 compatible systems. Note that the -n option as well as the effect of ‘\c’ are implementation-defined in IEEE Std 1003.1-2001 (“POSIX.1”) as amended by Cor. 1-2002. For portability, echo should only be used if the first argument does not start with a hyphen (‘-’) and does not contain any backslashes (‘\’). If this is not sufficient, printf(1) should be used.
Most shells provide a builtin echo command which tends to differ from this utility in the treatment of options and backslashes. Consult the builtin(1) manual page.

The echo utility exits 0 on success, and >0 if an error occurs.

builtin(1), csh(1), printf(1), sh(1)

The echo utility conforms to IEEE Std 1003.1-2001 (“POSIX.1”) as amended by Cor. 1-2002.

The echo command appeared in Version 2 AT&T UNIX.
October 5, 2016 FreeBSD 12.0-RELEASE

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