String argument within a gdb command file

First Last
Wed Jan 11 06:57:00 GMT 2012

I am trying to use add-symbol-file with arguments within a gdb command file.
add-symbol-file $filename $load_addr
I found that the $filename is not evaluated
(gdb) add-symbol-file $filename $load_addr
add symbol table from file "$filename" at
        .text_addr = 0x800000
(y or n) 

but print $filename works.
(gdb) print $filename
$1 = 0xabcd5678 "correct-obj-file.o"
(gdb) print $load_addr
$2 = (void*) 0x800000

I tried
shell awk '{printf "add-symbol-file $arg0 $arg1\n"}'
but, it did not help.
Any suggestions?

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