Hi,

NetBSD kaori 1.6 NetBSD 1.6 (KAORI_SM) #0: Tue Dec 17 12:23:22 UTC 2002
sh shell from the 1.6 release.


By mistake I entered a wrong command but even like that the result was not
the one expected.

The command was :
	cd test | grep blah

test is a directory. I know this command will produce no output. But for me
here is what should happend:
1. the 'cd test' command is executed.
	No stdout is generated. 
	The directory is changed.
2. the stdout from (1) is piped into the grep via the stdin
3. the 'grep blah' is printing to stdout the match between his stdin (cd
test stdout) and 'blah'
4. there should be no ouput.

All is running like that but, the directory is not changed.

# ls -l
[...]
drwxr-xr-x   2 root  wheel    512 Nov 13 16:33 scratch
drwxr-xr-x   2 root  wheel    512 Jan 10 10:14 scripts
# pwd
/root
# cd scratch | grep blah
# pwd
/root
#

I know that this command 'cd test | grep blah' is useless and should not
report anything, as I said it was a mistake. But why is the cd command is
not executed ?

As a test I ran it also on other OS with the same result (the shell was
always different):
- NetBSD 1.6 under sh
- Linux RH 7.3 under bash
- FreeBSD 4.? under ash
- SunOS under csh


can it be the the shell is really smart and just doesn't run the command as
he find-out there will be no output ?

Laurent\