Add initial pass at a cmd line spec

Signed-off-by: Doug Davis <dug@us.ibm.com>

README.md

@@ -16,6 +16,7 @@ Table of Contents
 - Runtime and Lifecycle
   - [General Runtime and Lifecycle](runtime.md)
   - [Linux-specific Runtime and Lifecycle](runtime-linux.md)
+  - [Runtime Command Line Interface](cmd.md)
 - Configuration
   - [General Configuration](config.md)
   - [Linux-specific Configuration](config-linux.md)

cmd.md

@@ -0,0 +1,94 @@
+# Runtime Command Line Interface
+
+This document specifies the command line syntax for runtime operations defined in the [Runtime and Lifecycle](runtime.md) specification.
+It is STRONGLY RECOMMENDED that implementations adhere to the command line definition defined below to ensure interoperability.
+This document will not duplicate the information/semantics specified in the [Runtime and Lifecycle](runtime.md) document, rather it just focuses on syntax of the command line.
+
+## Convention
+
+For the purpose of this document, the following syntactical conventions are used:
+
+* `[ ... ]` denotes an optional field
+* `< ... >` denotes a substitution field. 
+The word(s), or phrase, within the `<>` describes the information to be passed-in.
+
+## General Format and Behavior
+
+The general format of all commands MUST be:
+```
+runtime [global-options] action [action-specific-options] [arguments]
+```
+
+Upon successful running of an action, the exit code MUST be zero.
+
+If there is an error during the running of an action, then:
+* the exit code MUST be non-zero
+* any error text MUST be displayed on stderr
+* the state of the environment MUST be the same as if the action was never attempted (modulo any possible trivial ancillary changes such as logging)
+
+### Global Options
+
+Global options are ones that apply to all actions.
+This specification doesn't define any global options.
+Implementation MAY define their own.
+
+### Action Specific Options
+
+All actions MUST support the `--help` action-specific-option, which:
+* MUST display some help text to stdout
+* MUST NOT perform the `action` itself
+* MUST have an exit code of zero if the help text is successfully displayed
+
+Implementations MAY define their own action-specific options.
+
+## Actions
+
+This section defines the actions defined by this specification.
+
+### State
+
+Format: `runtime [global-options] state [options] <container-id>`
+
+Options: None
+
+This action MUST display the state of the specific container to stdout.
+Unless otherwise specified by the user, the format of the state MUST be in JSON.
+
+See [Query State](runtime.md#query-state).
+
+### Create
+
+Format: `runtime [global-options] create [options] <container-id>`
+
+Options:
+* `-b <dir>`,  `--bundle <dir>` The path to the root of the bundle directory. If not specified the default value MUST be the current working directory.
+* `--console <path>` The PTY slave path for the newly created container.
+* `--pid-file <path>` The file path into which the process ID is written. If not specified then a file MUST not be created.
+
+See [Create](runtime.md#create).
+
+### Start
+
+Format: `runtime [global-options] start [options] <container-id>`
+
+Options: None
+
+See [Start](runtime.md#start).
+
+### Kill
+
+Format: `runtime [global-options] kill [options] <container-id> <signal>`
+
+Options: None
+
+The `signal` MUST either be the signal's numerical value (e.g. `15`) or the signal's name (e.g. `SIGTERM`).
+
+See [Kill](runtime.md#kill).
+
+### Delete
+
+Format: `runtime [global-options] delete [options] <container-id>`
+
+Options: None
+
+See [Delete](runtime.md#delete).