本文介绍了如何使用命令行查看当前系统中安装的Bash版本信息，包括详细的版本号、发布日期及版权信息等。这有助于用户了解其使用的Bash版本是否为最新版，或者是否符合特定应用程序的要求。
bash-4.1$ bash --version
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 <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
bash-4.1$ echo $BASH_VERSION
echo $BASH_VERSION
4.1.2(1)-release
bash --version
GNU bash, version 4.1.2(1)-release (x86_64-redhat-linux-gnu)
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
bash-4.1$ echo $BASH_VERSION
echo $BASH_VERSION
4.1.2(1)-release
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