11-11-2008
UID and PWD are system variables which stand for "UserID" and "Print Working Directory"; you should pick definetly other names for your custom variables. Very unlucky pick
Do an echo on them in your shell and see what is assigned to them currently. UID will have the uid of your current user and is a read only variable.
PWD can be changed, but if you do so, any output like maybe in the prompt/PS1 will be messed up then.
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PWD(1) User Commands PWD(1)
NAME
pwd - print name of current/working directory
SYNOPSIS
pwd [OPTION]...
DESCRIPTION
Print the full filename of the current working directory.
-L, --logical
use PWD from environment, even if it contains symlinks
-P, --physical
avoid all symlinks
--help display this help and exit
--version
output version information and exit
If no option is specified, -P is assumed.
NOTE: your shell may have its own version of pwd, which usually supersedes the version described here. Please refer to your shell's docu-
mentation for details about the options it supports.
AUTHOR
Written by Jim Meyering.
REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report pwd translation bugs to <http://translationproject.org/team/>
COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
getcwd(3)
Full documentation at: <http://www.gnu.org/software/coreutils/pwd>
or available locally via: info '(coreutils) pwd invocation'
GNU coreutils 8.28 January 2018 PWD(1)