12-22-2018
It's not in vain that people advise to abstain from using
echo because its implementation is inconsistent and differs from system to system, and also between shell versions like
sh and
bash.
man sh resp.
man dash:
Quote:
echo [-n] args...
Print the arguments on the standard output, separated by spaces. Unless the -n option is present, a newline is output following the arguments.
If any of the following sequences of characters is encountered during output, the sequence is not output. Instead, the specified action is performed:
\b A backspace character is output.
\c Subsequent output is suppressed. This is normally used at the end of the last argument to suppress the trailing newline that echo would otherwise output.
\e Outputs an escape character (ESC).
\f Output a form feed.
\n Output a newline character.
whereas in
bash (or the external
/bin/echo) that behaviour needs to be switched on.
man bash:
Quote:
echo [-neE] [arg ...]
Output the args, separated by spaces, followed by a newline. The return status is 0 unless a write error occurs. ... If the -e option is given, interpretation of the following backslash-escaped characters is enabled.
So - you may call that an anomaly, but it is an expected and well known one.
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ECHO(1) BSD General Commands Manual ECHO(1)
NAME
echo -- write arguments to the standard output
SYNOPSIS
echo [-n] [string ...]
DESCRIPTION
The echo utility writes any specified operands, separated by single blank (' ') characters and followed by a newline ('
') character, to the
standard output.
The following option is available:
-n Do not print the trailing newline character. This may also be achieved by appending 'c' to the end of the string, as is done by iBCS2
compatible systems. Note that this 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. Applications aiming for maximum portability are strongly encouraged to use printf(1) to sup-
press the newline character.
Some shells may provide a builtin echo command which is similar or identical to this utility. Most notably, the builtin echo in sh(1) does
not accept the -n option. Consult the builtin(1) manual page.
EXIT STATUS
The echo utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
builtin(1), csh(1), printf(1), sh(1)
STANDARDS
The echo utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'') as amended by Cor. 1-2002.
BSD
April 12, 2003 BSD