工作中经常会遇到有符号到无符号的转化，写个c程序没必要，就用shell几行就好，int64和unsigned int64之间的：
signed_to_unsigned()
{
local hex=$(printf "0x%x" $(( $* )))
local unsigned=$(printf "%u" $hex )
echo $unsigned
}
unsigned_to_signed()
{
echo $(( $* ))
}
a=-1000
echo "a:" $a ", unsigned value:" `signed_to_unsigned $a`
b=18446744073709550616
echo "b:" $b ", signed value:" `unsigned_to_signed $b`
输出结果：
$ sh unsigned_to_signed.sh
a: -1000 , unsigned value: 18446744073709550616
b: 18446744073709550616 , signed value: -1000
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