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    <p>Yes, most things you can call will expect path that has been run through that idiom. When you use paths like that in the shell (eg, when you do something like <code>cat ~raxacoricofallapatorius/foo.txt</code>), it is <em>the shell itself</em> - rather than <code>cat</code> or any other program you might run - that does the path normalisation. </p> <p>You can verify this trivially - eg,</p> <pre><code>lvc@tiamat:~/Projects$ echo ~ /home/lvc </code></pre> <p>So this does mean that if you expect to get a path with those kinds of variables as input, you will need to do the preprocessing yourself. The alternative is to run the commands through a shell, and be ready to deal with all the problems <em>that</em> brings.</p> <p>However, at least on unix-like systems (Windows may or may not behave the same way), you <em>don't</em> need to do this for <code>.</code> and <code>..</code> - these are understood by the system calls, and the shell does not transform them - so, eg:</p> <pre><code>lvc@tiamat:~/Projects$ file .. ..: directory lvc@tiamat:~/Projects$ file ~ /home/lvc: directory </code></pre> <p>Notice that <code>file</code> sees <code>..</code> unchanged, but sees the expanded form of <code>~</code>.</p> <p>This means that if all you want is paths that will work directly in external programs, passing it through <code>expanduser</code> and possibly <code>expandvars</code> is sufficient. You will want to call <code>abspath</code> primarily if the program you are calling out to will run in a different working directory than yours.</p>
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