無法讓expand_aliases生效

Question

我無法在bash中獲得expand_aliases生效。我嘗試了很多不同的東西，沒有任何工作。

下面是簡單的測試用例：

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

和輸出：

$ /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，我使用禁用了javascript，而不是-o選項抨擊，只是爲了證明它的存在）

任何想法？

Answer 1

別名不在同一行或定義它們的相同函數中。

從Bash的手冊頁：

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     For almost every purpose, aliases are superseded by shell functions. 

的Bash Reference Manual說

對於幾乎每一個目標之後，殼牌功能優先了別名。

而不是上面的最後一句[強調我的]。我認爲別名是命令行的便利，而不是腳本中應該使用的內容（包括那些僅由bash -c單線程組成的腳本）。