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Document behaviour with symlinks and hard linked files.

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@@ -19,6 +19,14 @@ optimization, which is based on optimizing the Huffman tables. And
so called "lossy" optimization where in addition to optimizing Huffman
tables user can specify upperlimit for image quality.
+NOTE! By default jpegoptim modifies the input files (if they are optimized),
+to preserve original files use option \fB\-d\fR to specify alternate directory for saving the optimized files to.
+
+Only normal files are optimized (symbolic links and special files are skipped).
+Also, any other hard links to the file being optimized (as created using
+.BR link (2))
+are unaffected.
+
.SH OPTIONS
.PP

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