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    <p>On my machine, because of the way I have things set up, doing:</p> <pre><code>cd ~ # /work1/jleffler cd ~jleffler # /u/jleffler </code></pre> <p>The first pays attention to the value of environment variable <code>$HOME</code>; I deliberately set my <code>$HOME</code> to a local file system instead of an NFS-mounted file system. The second reads from the password file (approximately; NIS complicates things a bit) and finds that the password file says my home directory is <code>/u/jleffler</code> and changes to that directory.</p> <p>The annoying stuff is that most software behaves as above (and the POSIX specification for the shell requires this behaviour). I use some software (and I don't have much choice about using it) that treats the information from the password file as the current value of $HOME, which is wrong.</p> <p>Applying this to the question - as others have pointed out, '<code>cd ~x</code>' goes to the home directory of user 'x', and more generally, whenever tilde expansion is done, <code>~x</code> means the home directory of user 'x' (and it is an error if user 'x' does not exist).</p> <hr> <p>It might be worth mentioning that:</p> <pre><code>cd ~- # Change to previous directory ($OLDPWD) cd ~+ # Change to current directory ($PWD) </code></pre> <p>I can't immediately find a use for '<code>~+</code>', unless you do some weird stuff with moving symlinks in the path leading to the current directory.</p> <p>You can also do:</p> <pre><code>cd - </code></pre> <p>That means the same as <code>~-</code>.</p>
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    1. COAbout `cd ~+`: you could potentially use it to check if a directory you're currently in still exists - even if it is a pretty unorthodox way of doing so.
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