无法让expand_aliases生效

我不能让expand_aliases在bash中生效.我尝试了很多不同的事情,没有任何作用.

这是简单的测试用例：

/bin/bash -c 'shopt -s expand_aliases; alias cdtmp="cd /tmp"; alias; cdtmp; pwd;'

并输出：

$/bin/bash -c 'shopt -s expand_aliases; alias cdtmp="cd /tmp"; alias; cdtmp; pwd;'
alias cdtmp='cd /tmp'
/bin/bash: cdtmp: command not found
/home/user

$/bin/bash --version
GNU bash,version 3.2.25(1)-release (i686-redhat-linux-gnu)
copyright (C) 2005 Free Software Foundation,Inc.

(是的,我正在使用shopt而不是-O选项来bash,只是为了证明它已经完成了.)

有任何想法吗？

别名不可用于同一行或相同功能的定义.

从Bash手册页：

       The rules concerning the deFinition and use  of  aliases  are  somewhat
       confusing.   Bash  always  reads  at  least  one complete line of input
       before executing any  of  the  commands  on  that  line.   Aliases  are
       expanded  when  a command is read,not when it is executed.  Therefore,an alias deFinition appearing on the same line as another command  does
       not  take  effect  until  the next line of input is read.  The commands
       following the alias deFinition on that line are not affected by the new
       alias.   This  behavior  is  also an issue when functions are executed.
       Aliases are expanded when a function deFinition is read,not  when  the
       function  is  executed,because a function deFinition is itself a com‐
       pound command.  As a consequence,aliases defined in a function are not
       available  until  after  that function is executed.  To be safe,always
       put alias deFinitions on a separate line,and do not use alias in  com‐
       pound commands.

       For almost every purpose,aliases are superseded by shell functions.

Bash Reference Manual说

For almost every purpose,shell functions are preferred over aliases.

而不是[强调我的]最后一句.我认为别名是一个命令行的便利,而不是脚本中应该使用的东西(包括那些仅由bash -c一个线程组成的).