Add Clear The Screen In psql as a postgres til

Author: jbranchaud

README.md

@@ -7,7 +7,7 @@ variety of languages and technologies. These are things that don't really
 warrant a full blog post. These are mostly things I learn by pairing with
 smart people at [Hashrocket](http://hashrocket.com/).
 
-_378 TILs and counting..._
+_379 TILs and counting..._
 
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@@ -163,6 +163,7 @@ _378 TILs and counting..._
 - [Aggregate A Column Into An Array](postgres/aggregate-a-column-into-an-array.md)
 - [Auto Expanded Display](postgres/auto-expanded-display.md)
 - [Checking The Type Of A Value](postgres/checking-the-type-of-a-value.md)
+- [Clear The Screen In psql](postgres/clear-the-screen-in-psql.md)
 - [Compute Hashes With pgcrypto](postgres/compute-hashes-with-pgcrypto.md)
 - [Configure The Timezone](postgres/configure-the-timezone.md)
 - [Constructing A Range Of Dates](postgres/constructing-a-range-of-dates.md)

postgres/clear-the-screen-in-psql.md

@@ -0,0 +1,17 @@
+# Clear The Screen In psql
+
+The `psql` interactive terminal does not have a built-in way of clearing the
+screen. What I usually do if I really need the screen cleared is quit, run
+`clear` from the shell, and then open a new `psql` session. This is
+unnecessary though. Instead, we can use the `\!` command to execute a shell
+command, in this case, the `clear` command.
+
+```
+> \! clear
+```
+
+This clears the screen in one step and keeps our current session running.
+
+See the [psql
+docs](http://www.postgresql.org/docs/current/static/app-psql.html) for more
+details.