Re-consistentize $PWD usage

iojs/README.md

@@ -35,7 +35,7 @@ Then simply run:
 
 To run a single script, you can mount it in a volume under `/usr/src/app`. From the root of your application directory (assuming your script is named `index.js`):
 
-	$ docker run -v ${PWD}:/usr/src/app -w /usr/src/app -it --rm iojs iojs index.js
+	$ docker run -v "$PWD":/usr/src/app -w /usr/src/app -it --rm iojs iojs index.js
 
 # Image Variants
 

iojs/content.md

@@ -27,4 +27,4 @@ Then simply run:
 
 To run a single script, you can mount it in a volume under `/usr/src/app`. From the root of your application directory (assuming your script is named `index.js`):
 
-	$ docker run -v ${PWD}:/usr/src/app -w /usr/src/app -it --rm iojs iojs index.js
+	$ docker run -v "$PWD":/usr/src/app -w /usr/src/app -it --rm iojs iojs index.js

julia/README.md

@@ -22,7 +22,7 @@ Starting the Julia REPL is as easy as the following:
 
 ## Run Julia script from your local directory inside container
 
-	docker run -it --rm -v $(pwd):/usr/myapp -w /usr/myapp julia julia script.jl arg1 arg2
+	docker run -it --rm -v "$PWD":/usr/myapp -w /usr/myapp julia julia script.jl arg1 arg2
 
 # License
 

julia/content.md

@@ -16,4 +16,4 @@ Starting the Julia REPL is as easy as the following:
 
 ## Run Julia script from your local directory inside container
 
-	docker run -it --rm -v $(pwd):/usr/myapp -w /usr/myapp julia julia script.jl arg1 arg2
+	docker run -it --rm -v "$PWD":/usr/myapp -w /usr/myapp julia julia script.jl arg1 arg2

logstash/README.md

@@ -24,7 +24,7 @@ If you need to run logstash with configuration provided on the commandline, you
 
 If you need to run logstash with a configuration file, `logstash.conf`, that's located in your current directory, you can use the logstash image as follows:
 
-	docker run -it --rm -v $(pwd):/config-dir logstash logstash -f /config-dir/logstash.conf
+	docker run -it --rm -v "$PWD":/config-dir logstash logstash -f /config-dir/logstash.conf
 
 # License
 

logstash/content.md

@@ -18,4 +18,4 @@ If you need to run logstash with configuration provided on the commandline, you
 
 If you need to run logstash with a configuration file, `logstash.conf`, that's located in your current directory, you can use the logstash image as follows:
 
-	docker run -it --rm -v $(pwd):/config-dir logstash logstash -f /config-dir/logstash.conf
+	docker run -it --rm -v "$PWD":/config-dir logstash logstash -f /config-dir/logstash.conf