On Mon, Apr 02, 2018 at 08:57:35PM +0200, Denys Vlasenko wrote: > > I see this: > > $ x='\t'; echo "[$x]" > [ ] > > I'm pretty sure this isn't okay...
Why not? dash has always behaved like this and this is explicitly required by POSIX: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/echo.html OPERANDS The following operands shall be supported: string 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] [Option Start] 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: \a Write an <alert>. \b Write a <backspace>. \c Suppress the <newline> that otherwise follows the final argument in the output. All characters following the '\c' in the arguments shall be ignored. \f Write a <form-feed>. \n Write a <newline>. \r Write a <carriage-return>. \t Write a <tab>. \v Write a <vertical-tab>. \\ Write a <backslash> character. \0num Write an 8-bit value that is the zero, one, two, or three-digit octal number num. Cheers, -- Email: Herbert Xu <[email protected]> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe dash" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
