pwd - Return the current working directory

http://www.purl.org/tcl/home/man/tcl8.4/TclCmd/pwd.htm 

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'''pwd''' is always a fully normalized path (at least in Tcl 8.4a4 or newer).  This differs from Tcl 8.3 or older, where (on some platforms at least) '''pwd''' was whatever non-unique file representation was last passed to '''[cd]'''.  In Tcl8.4 '''pwd''' is guaranteed to be the unique normalized string representation of the path.

'''pwd''' may actually lie inside a virtual filesystem (and therefore be different to the OS'es perception of the pwd), if any are mounted.

'''pwd''' can actually change under some circumstances without the use of '''[cd]''', for example if '''pwd''' is inside a directory which is deleted with '''[file delete] -force''', Tcl moves the pwd out of the directory before deleting.

Note that the current directory is unfortunately a process-resource - so if you're using multiple interps in an event-driven situation, relying on a particular working directory between calls may cause you grief.
In fact even without multiple interps you shouldn't write procs that rely on a particular working directory as again, you could get unexpected results if calls are interleaved with other parts of your application.

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Under what circumstances might [[pwd]] fail to return a result? I would have assumed it would be guaranteed to return a path without error - but the result below shows otherwise.  (on FreeBSD 4.9-STABLE tcl8.4.4 tclkit)

 error getting working directory name: no such file or directory
     while executing
 "pwd"
     (in namespace eval "::math" script line 20)
     invoked from within
 "namespace eval ::math { 

     variable version 1.2.2
 
     # misc.tcl
 
     namespace export    cov             fibonacci       integrate
     namespace export    max             mean            min..."
     (file "/root/shelltests/nefualert.vfs/lib/tcllib1.5/math/math.tcl" line 15)
     invoked from within
 "source /root/shelltests/nefualert.vfs/lib/tcllib1.5/math/math.tcl"
     ("package ifneeded" script)
     invoked from within
 "package require math"




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