sh 在bash中生成UUID4的便携方法

Posted 2021-05-07

uuid4() {
  first=`LC_ALL=C tr -dc a-f0-9 < /dev/urandom  |
    dd bs=8 count=1 2> /dev/null`
  second=`LC_ALL=C tr -dc a-f0-9 < /dev/urandom |
    dd bs=4 count=1 2> /dev/null`
  third=`LC_ALL=C tr -dc a-f0-9 < /dev/urandom  |
    dd bs=4 count=1 2> /dev/null`
  fourth=`LC_ALL=C tr -dc a-f0-9 < /dev/urandom |
    dd bs=12 count=1 2> /dev/null`
  printf "$first-$second-$third-$fourth"
}