Bash未绑定变量数组(脚本:s3-bash)

这里似乎有一个bash行为改变.

由kojiro发现:变化

HHHH.修复了导致`declare'和`test'查找已赋予属性但未赋值的变量的错误.这些变量没有设定.

$ bash --version
GNU bash, version 3.2.25(1)-release (x86_64-redhat-linux-gnu)
Copyright (C) 2005 Free Software Foundation, Inc.
$ set -u
$ declare -a tF
$ echo "${#tF[@]}"
0

与

$ bash --version
GNU bash, version 4.1.2(1)-release (x86_64-redhat-linux-gnu)
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ set -u
$ declare -a tF
$ echo "${#tF[@]}"
0

与

$ bash --version
GNU bash, version 4.3.30(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ set -u
$ declare -a tF
$ echo "${#tF[@]}"
-bash: tF: unbound variable

您可以使用declare -a tF=()较新的bash版本来解决此问题.

$ declare -a tF=()
$ echo "${#tF[@]}"
0