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Full Discussion: Single quote _error_.
Top Forums Shell Programming and Scripting Single quote _error_. Post 303027726 by RudiC on Saturday 22nd of December 2018 11:08:23 AM
Old 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.
These 3 Users Gave Thanks to RudiC For This Post:
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LEARN ABOUT X11R4

echo

ECHO(1)                                                            User Commands                                                           ECHO(1)

NAME

       echo - display a line of text

SYNOPSIS

       echo [SHORT-OPTION]... [STRING]...
       echo LONG-OPTION

DESCRIPTION

       Echo the STRING(s) to standard output.

       -n     do not output the trailing newline

       -e     enable interpretation of backslash escapes

       -E     disable interpretation of backslash escapes (default)

       --help display this help and exit

       --version
              output version information and exit

       If -e is in effect, the following sequences are recognized:

       \     backslash

       a     alert (BEL)

            backspace

       c     produce no further output

       e     escape

       f     form feed

       
     new line

       
     carriage return

       	     horizontal tab

       v     vertical tab

       NNN  byte with octal value NNN (1 to 3 digits)

       xHH   byte with hexadecimal value HH (1 to 2 digits)

       NOTE: your shell may have its own version of echo, which usually supersedes the version described here.  Please refer to your shell's docu-
       mentation for details about the options it supports.

AUTHOR

       Written by Brian Fox and Chet Ramey.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report echo translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/echo>
       or available locally via: info '(coreutils) echo invocation'

GNU coreutils 8.28                                                 January 2018                                                            ECHO(1)
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