Problem with tr command Post: 302653229

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Top Forums Shell Programming and Scripting Problem with tr command Post 302653229 by methyl on Friday 8th of June 2012 02:39:47 PM

06-08-2012

Registered User

@alister
Very good explanation and example.

If it can be explained by a simple change of environment that's brilliant. I'd forgotten about certain Linux using UTF-8 and some of the other consequences like really slow sort, grep, sed etc. . There are many advantages of UTF-8/UTF-16/UTF-nn in the Word Processing world but I can't see any advantage on the default command line.

As you will all know I'm a bit of a Posix cynic (though I support the Posix ideal) mainly because I come across too many non-compliant situations. I have lost track of the "current Posix standard" (despite @jlliagre's best efforts).

I'm not sure that the Original Post is 100% one of those situations because the O/P noticed that what I believed was the portable syntax worked. The Linux/BSD amomaly with the treatment of quoted square brackets in the tr command is in my opinion a coding error.

Quote:

The \[ and \] escape sequences are undefined in POSIX. Their use is not portable.

Not sure if that quote in context because this is nothing to do with Escape Sequences (like for Printer control). If it is, then IMHO that Posix standard needs urgent correction. It's universally expected in unix syntax that a character which is part of the syntax of a command must be escaped if it is to be considered as data.

Last edited by methyl; 06-08-2012 at 04:42 PM.. Reason: thinking on my feet ; typos ; corrections ; clarifications

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LEARN ABOUT PHP

utf8_encode

UTF8_ENCODE(3)								 1							    UTF8_ENCODE(3)

utf8_encode - Encodes an ISO-8859-1 string to UTF-8

SYNOPSIS

       string utf8_encode (string  $data)

DESCRIPTION

	This  function	encodes  the  string  $data  to UTF-8, and returns the encoded version.  UTF-8 is a standard mechanism used by Unicode for
       encoding wide character values into a byte stream.  UTF-8 is transparent to plain ASCII characters, is  self-synchronized  (meaning  it	is
       possible  for a program to figure out where in the bytestream characters start) and can be used with normal string comparison functions for
       sorting and such. PHP encodes UTF-8 characters in up to four bytes, like this:

       UTF-8 encoding

       +------+-------------------------------------+---+
       |bytes | 				    |	|
       |      | 				    |	|
       |      | 	       bits		    |	|
       |      | 				    |	|
       |      | 	  representation	    |	|
       |      | 				    |	|
       +------+-------------------------------------+---+
       |  1   | 				    |	|
       |      | 				    |	|
       |      | 		 7		    |	|
       |      | 				    |	|
       |      | 	     0bbbbbbb		    |	|
       |      | 				    |	|
       |  2   | 				    |	|
       |      | 				    |	|
       |      | 		11		    |	|
       |      | 				    |	|
       |      | 	 110bbbbb 10bbbbbb	    |	|
       |      | 				    |	|
       |  3   | 				    |	|
       |      | 				    |	|
       |      | 		16		    |	|
       |      | 				    |	|
       |      |     1110bbbb 10bbbbbb 10bbbbbb	    |	|
       |      | 				    |	|
       |  4   | 				    |	|
       |      | 				    |	|
       |      | 		21		    |	|
       |      | 				    |	|
       |      | 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb |	|
       |      | 				    |	|
       +------+-------------------------------------+---+
	Each b represents a bit that can be used to store character data.

PARAMETERS

	      o $data
		- An ISO-8859-1 string.

RETURN VALUES

	Returns the UTF-8 translation of $data.

SEE ALSO

       utf8_decode(3).

PHP Documentation Group 													    UTF8_ENCODE(3)