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Top Forums Shell Programming and Scripting Preserve trailing whitespace in variable Post 302726889 by wyderkat on Monday 5th of November 2012 10:06:15 AM
Old 11-05-2012
It's advised to always double quote variable in a shell script.
Code:
"$var"

The reason for that is treating shell code and shell data in variables equivalently! Not like in other languages that line of code is different entity/type of text than line of string stored under variable. Here it is the same.

In your case $str is expanded correctly with space at the end, but it is then just space in a command line, so it is discarded

You can find more info in this article http://www.cofoh.com/white-shell
 

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MD5(3)									 1								    MD5(3)

md5 - Calculate the md5 hash of a string

SYNOPSIS
string md5 (string $str, [bool $raw_output = false]) DESCRIPTION
Calculates the MD5 hash of $str using the RSA Data Security, Inc. MD5 Message-Digest Algorithm, and returns that hash. PARAMETERS
o $str - The string. o $raw_output - If the optional $raw_output is set to TRUE, then the md5 digest is instead returned in raw binary format with a length of 16. RETURN VALUES
Returns the hash as a 32-character hexadecimal number. EXAMPLES
Example #1 A md5(3) example <?php $str = 'apple'; if (md5($str) === '1f3870be274f6c49b3e31a0c6728957f') { echo "Would you like a green or red apple?"; } ?> NOTES
Note Secure password hashing It is not recommended to use this function to secure passwords, due to the fast nature of this hashing algorithm. See here for details. SEE ALSO
md5_file(3), sha1_file(3), crc32(3), sha1(3), hash(3), crypt(3), password_hash(3). PHP Documentation Group MD5(3)
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