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cd is a bash built-in cmd, where '~' means 'home dir of specified user', default 'current user' if none specified.
To emulate that I think you'll have to write a short script and ensure it's always in a dir in your $PATH env variable.
If you get it working, post it here, as i'm sure others would like to see it.
You can't, it's a shell builtin feature.
~someone means someone's homedir
If you want that, you still can create a user account whose name is vpopmail and whose home directory is the directory where you want to go with "cd ~vpopmail"
These have nothing to do with system variables, variables start with $ not ~.
Ok, so basically the solution is to create a user that can't use a shell and has a home directory of whatever dir. I want to access?
I knew cd ~username works but I never thought about that. Thanks!
$ bash --version
GNU bash, version 3.00.16(1)-release (i386-pc-solaris2.11)
Copyright (C) 2004 Free Software Foundation, Inc.
$ alias 'cd ~whatever'='cd /folder/whereever'
bash: alias: `cd ~whatever': invalid alias name