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Top Forums Shell Programming and Scripting sed replacing specific characters and control characters by escaping Post 302633901 by ijustneeda on Wednesday 2nd of May 2012 04:08:06 PM
Old 05-02-2012
Single quotes seem to fail in following cases:
Code:
echo "abc- cde fg ' hi" | sed -e 's/[\.\/\%'=:\(\)\`_\'\@\;\+\*\#\$\?\!]/ /g'
echo "abc- cde fg ' hi" | sed -e 's/[\.\/\%'=:\(\)\`_"'"\@\;\+\*\#\$\?\!]/ /g'

As single quotes cannot be escaped with a backslash and double quotes like to evaluate, looks like double quotes is a best bet in my case.

Still investigating if we use sed double quoted "" escape normal character such as number 1 as \1 inside the sed, will it replace the \ and 1 as well, I know it \$ evaluates to $?

---------- Post updated at 01:08 PM ---------- Previous update was at 01:02 PM ----------

Quote:
Originally Posted by ijustneeda
Single quotes seem to fail in following cases:
Code:
echo "abc- cde fg ' hi" | sed -e 's/[\.\/\%'=:\(\)\`_\'\@\;\+\*\#\$\?\!]/ /g'
echo "abc- cde fg ' hi" | sed -e 's/[\.\/\%'=:\(\)\`_"'"\@\;\+\*\#\$\?\!]/ /g'

As single quotes cannot be escaped with a backslash and double quotes like to evaluate, looks like double quotes is a best bet in my case.

Still investigating if we use sed double quoted "" escape normal character such as number 1 as \1 inside the sed, will it replace the \ and 1 as well, I know it \$ evaluates to $?
Bad example of \1 as it is back reference Smilie, let me use \A
echo "abc-A \ cde fg A \ hi" | sed -e "s/\A/ /g"
abc- \ cde fg \ hi
does not replace '\'
 

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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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