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Re: cd and pushd do not set $PWD and $cwd correctly in tcsh on NT


Eugene,

The shells track the current working directly internally based on the invocation of cd, pushd and popd commands.

The binary executable "/bin/pwd.exe" must traverse the parent directory links to the root in order to discover the current working directory, since unlike the shells it has no prior notion of what the working directory is when it's invoked. It effectively reports a "canonical" curent directory name.

There are counterparts to the kinds of discrepancies you're seeing in everyday Unix and Linux systems. In those systems (and in Cygwin) symbolic links are the usual way these discrepancies arise (offhand, they're the only way in Unix and Linux, but I may be overlooking something).

There's really nothing to be done about the fact that directory names can be aliased, whether it's via Cygwin's unmounted drive directory (by default, "/cygdrive"), the aliasing that can occur in Cygwin do to its more flexible mount scheme or symlinks, which are equally possible in Cygwin and in Unix / Linux.

Randall Schulz
Mountain View, CA USA


At 11:56 2002-10-25, Eugene_Reznik@putnam.com wrote:
I am runnning into the following problem:


1. start tcsh
2. cd /
3. cd c:/winnt

After the last commnad the working directoy is /cygdrive/c/winnt. The
output of the pwd command confirms this. However, both $PWD and $cwd are
set to: /c:/winnt. See below:


/cygdrive/d> cd /

16 /> cd c:/winnt

17 /c:/winnt> pwd
/cygdrive/c/winnt
18 /c:/winnt> echo $PWD
/c:/winnt
19 /c:/winnt> echo $cwd
/c:/winnt
20 /c:/winnt>

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