G'day,
This working as documented.
The relevant part of the manual is, I think:
"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."
If aaa is not already defined, the actual behaviour is:
$ alias aaa='echo aaa'; ( alias aaa='echo bbb'; aaa ; )
-bash: aaa: command not found
Which is consistent with the manual page. If aaa is already defined, then
$ alias aaa='echo aaa'; ( alias aaa='echo bbb'; aaa ; )
aaa
which is what you observed.
Use unalias aaa and then you will get:
$ alias aaa='echo aaa'; ( alias aaa='echo bbb'; aaa ; )
-bash: aaa: command not found
jon.
On 11/01/2009, at 23:18, Коренберг Марк
wrote:
> Configuration Information [Automatically generated, do not change]:
> Machine: i486
> OS: linux-gnu
> Compiler: gcc
> Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i486' -
> DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i486-pc-linux-gnu' -
> DCONF_VENDOR='pc' -DLOCALED $uname output: Linux mmarkk-desktop
> 2.6.27-11-generic #1 SMP Thu Jan 8 08:38:33 UTC 2009 i686 GNU/Linux
> Machine Type: i486-pc-linux-gnu
>
> Bash Version: 3.2
> Patch Level: 39
> Release Status: release
>
> Description:
> See Repeat-by section.
>
> Repeat-By:
> alias aaa='echo aaa'; ( alias aaa='echo bbb'; aaa ; )
> Will print 'aaa' instead of 'bbb' as I expect.
>
>
