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Top Forums Shell Programming and Scripting Double quotes or single quotes when using ssh? Post 302200681 by password636 on Thursday 29th of May 2008 08:52:49 PM
Old 05-29-2008
Quote:
Originally Posted by era
Double quotes don't prevent variables from being expanded locally. So the remote host sees "ITSME=itsyou; echo itsme" in the first case.
So the two statements: ITSME=itsyou & echo $ITSME are both executed on remote host. But in the case of double quotes, variable will be evaluated first so the argument passed to ssh is actually ITSME=itsyou; echo itsme. While in the case of single quotes, no special characters survive. The argument passed to ssh is ITSME=itsyou; echo $ITSME. Understood, this is really an issue of command-line processing.
 

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GET_MAGIC_QUOTES_GPC(3) 						 1						   GET_MAGIC_QUOTES_GPC(3)

get_magic_quotes_gpc - Gets the current configuration setting of magic_quotes_gpc

SYNOPSIS
bool get_magic_quotes_gpc (void ) DESCRIPTION
Returns the current configuration setting of magic_quotes_gpc Keep in mind that attempting to set magic_quotes_gpc at runtime will not work. For more information about magic_quotes, see this security section. RETURN VALUES
Returns 0 if magic_quotes_gpc is off, 1 otherwise. Or always returns FALSE as of PHP 5.4.0. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.4.0 | | | | | | | Always returns FALSE because the magic quotes | | | feature was removed from PHP. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 get_magic_quotes_gpc(3) example <?php // If magic quotes are enabled echo $_POST['lastname']; // O'reilly echo addslashes($_POST['lastname']); // O\'reilly // Usage across all PHP versions if (get_magic_quotes_gpc()) { $lastname = stripslashes($_POST['lastname']); } else { $lastname = $_POST['lastname']; } // If using MySQL $lastname = mysql_real_escape_string($lastname); echo $lastname; // O'reilly $sql = "INSERT INTO lastnames (lastname) VALUES ('$lastname')"; ?> NOTES
Note If the directive magic_quotes_sybase is ON it will completely override magic_quotes_gpc. So even when get_magic_quotes_gpc(3) returns TRUE neither double quotes, backslashes or NUL's will be escaped. Only single quotes will be escaped. In this case they'll look like: '' SEE ALSO
addslashes(3), stripslashes(3), get_magic_quotes_runtime(3), ini_get(3). PHP Documentation Group GET_MAGIC_QUOTES_GPC(3)
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