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Top Forums Shell Programming and Scripting Uppercase to lowercase and vice versa Post 302508405 by alister on Monday 28th of March 2011 04:33:01 AM
Old 03-28-2011
Quote:
Originally Posted by tene
Code:
echo "this is small case" | tr '[[:lower:]]' '[[:upper:]]'
THIS IS SMALL CASE

The syntax for a tr character class uses single brackets not double; tr does not use regular expressions. If you are unconvinced, try the following:

Code:
echo '[abc]' | tr -d '[[:lower:]]'

and compare the result to
Code:
echo '[abc]' | tr -d '[:lower:]'

which is equivalent to the following sed, which does use regular expressions
Code:
echo '[abc]' | sed 's/[[:lower:]]//g'

In your original test case, it only appears to work because '[' in the first string is matched by an identical '[' in the second, so that the translisteration does not change the result (same for ']').

Regards,
Alister
 

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ADDCSLASHES(3)								 1							    ADDCSLASHES(3)

addcslashes - Quote string with slashes in a C style

SYNOPSIS
string addcslashes (string $str, string $charlist) DESCRIPTION
Returns a string with backslashes before characters that are listed in $charlist parameter. PARAMETERS
o $str - The string to be escaped. o $charlist - A list of characters to be escaped. If $charlist contains characters , etc., they are converted in C-like style, while other non-alphanumeric characters with ASCII codes lower than 32 and higher than 126 converted to octal representation. When you define a sequence of characters in the charlist argument make sure that you know what characters come between the characters that you set as the start and end of the range. <?php echo addcslashes('foo[ ]', 'A..z'); // output: foo[ ] // All upper and lower-case letters will be escaped // ... but so will the []^_` ?> <?php echo addcslashes("zoo['.']", 'z..A'); // output: zoo['.'] ?> RETURN VALUES
Returns the escaped string. CHANGELOG
+--------+---------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------+ | 5.2.5 | | | | | | | The escape sequences v and f were added. | | | | +--------+---------------------------------------------+ EXAMPLES
$charlist like "..37", which would escape all characters with ASCII code between 0 and 31. Example #1 addcslashes(3) example <?php $escaped = addcslashes($not_escaped, "..37!@177..377"); ?> SEE ALSO
stripcslashes(3), stripslashes(3), addslashes(3), htmlspecialchars(3), quotemeta(3). PHP Documentation Group ADDCSLASHES(3)
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