If getting this detailed you might search for UNIX98 in the comments in
http://cvs.gnome.org/viewcvs/glib/glib/gshell.c?view=markup
I believe GNOME uses g_shell_parse_command_line for the Exec field, but
don't know for sure.
Havoc
Bastian, Waldo wrote:
"
Arguments may be quoted in whole. If an argument contains a reserved
character the argument must be quoted. The rules for quoting of
arguments is also applicable to the executable name or path of the
executable program as provided.
Quoting must be done by enclosing the argument between double quotes and
escaping the double quote character, backtick character ("`"), dollar
sign ("$") and backslash character ("\") by preceding it with an
additional backslash character. Implementations must undo quoting before
expanding field codes and before passing the argument to the executable
program. Reserved characters are space (" "), tab, newline, double
quote, single quote ("'"), greater-than sign (">"), less-than sign
("<"), tilde ("~"), vertical bar ("|"), ampersand ("&"), semicolon
(";"), dollar sign ("$"), asterisk ("*"), question mark ("?"), equal
sign ("="), parenthesis ("(") and (")") and backtick character ("`").
Note that the general escape rule for values of type string states that
the backslash character can be escaped as ("\\") as well and that this
escape rule is applied before the quoting rule. As such, to
unambiguously represent a literal backslash character in a quoted
argument in a desktop entry file requires the use of four successive
backslash characters ("\\\\"). Likewise, a literal dollar sign in a
quoted argument in a desktop entry file is unambiguously represented
with ("\\$").
"
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