Add Specify the Directory of a Shell Command as a clojure til.

Author: jbranchaud

README.md

@@ -9,6 +9,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 
 ### clojure
 
+- [Specify the Directory of a Shell Command](clojure/specify-the-directory-of-a-shell-command.md)
 - [Splitting On Whitespace](clojure/splitting-on-whitespace.md)
 - [Type of Anything](clojure/type-of-anything.md)
 

clojure/specify-the-directory-of-a-shell-command.md

@@ -0,0 +1,27 @@
+# Specify the Directory of a Shell Command
+
+Clojure gives us access to Java's shell capabilities through
+`clojure.java.shell`. For instance, if you want to list the contents of your
+project's directory, you can issue an `ls` command:
+
+```
+> (clojure.java.shell/sh "ls")
+; {:exit 0,
+;  :out "LICENSE\nREADME.md\ndoc\nproject.clj\nresources\nsrc\ntarget\ntest\n",
+;  :err ""}
+```
+
+The default will always be to execute the command in the directory of the
+containing project. It is likely that you'd like to specify a different
+directory though. There is a function for that:
+
+```clojure
+(clojure.java.shell/with-sh-dir "some/dir" (clojure.java.shell/sh "ls"))
+```
+
+Or more concisely, you can specify the directory as part of the `sh`
+function:
+
+```clojure
+(clojure.java.shell/sh "ls" :dir "some/dir")
+```