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Top Forums Shell Programming and Scripting not being able to escape "$" is doing my head in. Post 302188308 by era on Wednesday 23rd of April 2008 06:25:58 AM
Old 04-23-2008
As usual, your problem is with quoting.

Code:
file='products_jsp$products_jspHelper.class'  # single quotes don't need backslashes
file="`echo "$file" | sed 's/\\$/\\\\$/'`"
echo "$file"

When you echo $file without double quotes, the shell will do backslash parsing etc. The simple lesson to learn is to always use double quotes around variables.

The doubling of backslashes in the sed expression is also an artefact of the shell's backslash parsing. In order to get a literal backslash in the regular expression, sed wants it doubled; but each of those doubled backslashes needs to be backslash-escaped in order for the shell to pass it literally to sed. (Whew.)

(Oh, and lesson two: don't trust echo to tell you the truth, the whole truth, and nothing but the truth.)

Last edited by era; 04-23-2008 at 07:34 AM.. Reason: Need absurd amounts of backslashes
 

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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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