all: implement command "env-get" to get value from environment files

The env-get command get the value from environment files.
Syntax,

----
<key> [dir]
----

The "key" argument define the key where value is stored in environment
using "section:sub:name" format.
The "dir" argument is optional, its define the directory where environment
files will be loaded, recursively, from BaseDir to dir.
If its empty default to the current directory.

1 files changed, 2 insertions, 0 deletions

diff --git a/testdata/env-get/awwan.env b/testdata/env-get/awwan.env
new file mode 100644
index 0000000..0467fe1
--- /dev/null
+++ b/testdata/env-get/awwan.env
@@ -0,0 +1,2 @@
+[host]
+name = localhost