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<h3>9.3.51: `<font color="#82140F"><code>unlink</code></font>'</h3>
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`unlink \filename'
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Delete a filename and possibly the file to which it refers. On
non-unix machines, this simply means to delete the file. On unix
machines, the action is more subtle. The unix OS permits several
processes to use a given file at once. Therefore, `<font color="#82140F"><code>unlink</code></font>'
doesn't immediately remove the file, but instead waits until other
processes are done with it. Most users will never realize the
difference, however, and it is safe to think of `<font color="#82140F"><code>unlink</code></font>' as
simply removing the file. To learn more, type `<font color="#82140F"><code>man unlink</code></font>' in a
unix shell.
<p>
A common use of `<font color="#82140F"><code>unlink</code></font>' is to remove files that were created
with the `<font color="82140F"><code>tmpname</code></font>' facility (see <a href="OperatingSystem.html#UsingOSInsideGri">Using OS Inside Gri</a>), e.g.
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\tmp = tmpname
# do some system commands to put data into this file
open \tmp
read columns x y
draw curve
unlink \tmp
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