Add Sort In Numerical Order as a unix til

unix/sort-in-numerical-order.md

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+# Sort In Numerical Order
+
+By default, the `sort` command will sort things alphabetically. If you have
+numerical input though, you may want a numerical sort. This is what the `-n`
+flag is for.
+
+If I have a directory of files with numbered names, sort doesn't quite do
+the job by itself.
+
+```bash
+$ ls | sort
+1.txt
+10.txt
+11.txt
+12.txt
+2.txt
+3.txt
+4.txt
+5.txt
+```
+
+with the `-n` flag, I get the sort order I am looking for.
+
+```bash
+$ ls | sort -n
+1.txt
+2.txt
+3.txt
+4.txt
+5.txt
+10.txt
+11.txt
+12.txt
+```