In article <[EMAIL PROTECTED]>, Huang. wrote:
> Why env in cygwin work like these:
I am sure this is off topic, since all UNIX shells based on Bourne
shell will behave this way. This is not specific to Cygwin.
> $ AAAA=aaa echo $AAAA
This syntax says: Set variable AAA to aaa in the environment of the
command "echo $AAA". However, the command "echo $AAA" will echo the
value of variable AAA in the current environment, since the expansion
of variables occurs before the command is executed.
> $ AAAA=aaa; echo $AAAA
> aaa
According to the explanation above, this is expected behavior.
> $ echo $AAAA
> aaa
According to the explanation above, this is expected behavior.
To do what I think you want to test try the following:
AAA=bbb eval 'echo $AAA in' ; echo $AAA out
or AAA=bbb sh -c 'echo $AAA in' ; echo $AAA out
or (AAA=bbb; echo $AAA in) ; echo $AAA out
All of these commands involve echoing the value of AAA in an environment
that is in the inner scope of the environment of the command line.
-- James
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