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+Sgrep (sorted grep) searches sorted input files for lines that match a
+search key and outputs the matching lines. When searching large files
+sgrep is much faster than traditional Unix grep, but with significant
+restrictions.
+
+ * All input files must be sorted regular files.
+ * The sort key must start at the beginning of the line.
+ * The search key matches only at the beginning of the line.
+ * No regular expression support.