/usr/lib/radare/bin/ffftoneg is in radare-common 1:1.5.2-6.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | #!/usr/bin/env perl
#
# Comment out 0xffff* values . useful for piping the objdump output
#
while (($str = <STDIN>)) {
$str=~s/\(.*//g;
if ($str=~/0xffff/) {
chomp($str);
$str=~/(0xffff.*)/;
$num=`rax $1`;
$str.=" ; $num";
}
print "$str";
}
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