Merge pull request #150 from stuartpb/pwd

Replace `$(pwd)` with `$PWD`

clojure/README.md

@@ -67,7 +67,7 @@ You can then build and run the image as above.
 If you have an existing Lein/Clojure project, it's fairly straightforward to
 compile your project into a jar from a container:
 
-    docker run -it --rm -v "$(pwd)":/usr/src/app -w /usr/src/app clojure lein uberjar
+    docker run -it --rm -v "$PWD":/usr/src/app -w /usr/src/app clojure lein uberjar
 
 This will build your project into a jar file located in your project's
 `target/uberjar` directory.

clojure/content.md

@@ -56,7 +56,7 @@ You can then build and run the image as above.
 If you have an existing Lein/Clojure project, it's fairly straightforward to
 compile your project into a jar from a container:
 
-    docker run -it --rm -v "$(pwd)":/usr/src/app -w /usr/src/app clojure lein uberjar
+    docker run -it --rm -v "$PWD":/usr/src/app -w /usr/src/app clojure lein uberjar
 
 This will build your project into a jar file located in your project's
 `target/uberjar` directory.

django/README.md

@@ -50,14 +50,14 @@ Of course, if you don't want to take advantage of magical and convenient
 `ONBUILD` triggers, you can always just use `docker run` directly to avoid
 having to add a `Dockerfile` to your project.
 
-    docker run --name some-django-app -v "$(pwd)":/usr/src/app -w /usr/src/app -p 8000:8000 -d django bash -c "pip install -r requirements.txt && python manage.py runserver 0.0.0.0:8000"
+    docker run --name some-django-app -v "$PWD":/usr/src/app -w /usr/src/app -p 8000:8000 -d django bash -c "pip install -r requirements.txt && python manage.py runserver 0.0.0.0:8000"
 
 ## Bootstrap a new Django Application
 
 If you want to generate the scaffolding for a new Django project, you can do the
 following:
 
-    docker run -it --rm --user "$(id -u):$(id -g)" -v "$(pwd)":/usr/src/app -w /usr/src/app django django-admin.py startproject mysite
+    docker run -it --rm --user "$(id -u):$(id -g)" -v "$PWD":/usr/src/app -w /usr/src/app django django-admin.py startproject mysite
 
 This will create a sub-directory named `mysite` inside your current directory.
 

django/content.md

@@ -37,13 +37,13 @@ Of course, if you don't want to take advantage of magical and convenient
 `ONBUILD` triggers, you can always just use `docker run` directly to avoid
 having to add a `Dockerfile` to your project.
 
-    docker run --name some-django-app -v "$(pwd)":/usr/src/app -w /usr/src/app -p 8000:8000 -d django bash -c "pip install -r requirements.txt && python manage.py runserver 0.0.0.0:8000"
+    docker run --name some-django-app -v "$PWD":/usr/src/app -w /usr/src/app -p 8000:8000 -d django bash -c "pip install -r requirements.txt && python manage.py runserver 0.0.0.0:8000"
 
 ## Bootstrap a new Django Application
 
 If you want to generate the scaffolding for a new Django project, you can do the
 following:
 
-    docker run -it --rm --user "$(id -u):$(id -g)" -v "$(pwd)":/usr/src/app -w /usr/src/app django django-admin.py startproject mysite
+    docker run -it --rm --user "$(id -u):$(id -g)" -v "$PWD":/usr/src/app -w /usr/src/app django django-admin.py startproject mysite
 
 This will create a sub-directory named `mysite` inside your current directory.

gcc/README.md

@@ -48,7 +48,7 @@ There may be occasions where it is not appropriate to run your app inside a
 container. To compile, but not run your app inside the Docker instance, you can
 write something like:
 
-    docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp gcc:4.9 gcc -o myapp myapp.c
+    docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp gcc:4.9 gcc -o myapp myapp.c
 
 This will add your current directory, as a volume, to the container, set the
 working directory to the volume, and run the command `gcc -o myapp myapp.c.`
@@ -56,7 +56,7 @@ This tells gcc to compile the code in `myapp.c` and output the executable to
 myapp. Alternatively, if you have a `Makefile`, you can instead run the `make`
 command inside your container:
 
-    docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp gcc:4.9 make
+    docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp gcc:4.9 make
 
 # License
 

gcc/content.md

@@ -35,7 +35,7 @@ There may be occasions where it is not appropriate to run your app inside a
 container. To compile, but not run your app inside the Docker instance, you can
 write something like:
 
-    docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp gcc:4.9 gcc -o myapp myapp.c
+    docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp gcc:4.9 gcc -o myapp myapp.c
 
 This will add your current directory, as a volume, to the container, set the
 working directory to the volume, and run the command `gcc -o myapp myapp.c.`
@@ -43,4 +43,4 @@ This tells gcc to compile the code in `myapp.c` and output the executable to
 myapp. Alternatively, if you have a `Makefile`, you can instead run the `make`
 command inside your container:
 
-    docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp gcc:4.9 make
+    docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp gcc:4.9 make

golang/README.md

@@ -55,7 +55,7 @@ There may be occasions where it is not appropriate to run your app inside a
 container. To compile, but not run your app inside the Docker instance, you can
 write something like:
 
-    docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp golang:1.3 go build -v
+    docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp golang:1.3 go build -v
 
 This will add your current directory as a volume to the container, set the
 working directory to the volume, and run the command `go build` which will tell
@@ -63,7 +63,7 @@ go to compile the project in the working directory and output the executable to
 `myapp`. Alternatively, if you have a `Makefile`, you can run the `make` command
 inside your container.
 
-    docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp golang:1.3 make
+    docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp golang:1.3 make
 
 ## Cross-compile your app inside the Docker container
 
@@ -71,11 +71,11 @@ If you need to compile your application for a platform other than `linux/amd64`
 (such as `windows/386`), this can be easily accomplished with the provided
 `cross` tags:
 
-    docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp -e GOOS=windows -e GOARCH=386 golang:1.3-cross go build -v
+    docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp -e GOOS=windows -e GOARCH=386 golang:1.3-cross go build -v
 
 Alternatively, you can build for multiple platforms at once:
 
-    docker run --rm -it -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp golang:1.3-cross bash
+    docker run --rm -it -v "$PWD":/usr/src/myapp -w /usr/src/myapp golang:1.3-cross bash
     $ for GOOS in darwin linux; do
     >   for GOARCH in 386 amd64; do
     >     go build -v -o myapp-$GOOS-$GOARCH

golang/content.md

@@ -38,7 +38,7 @@ There may be occasions where it is not appropriate to run your app inside a
 container. To compile, but not run your app inside the Docker instance, you can
 write something like:
 
-    docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp golang:1.3 go build -v
+    docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp golang:1.3 go build -v
 
 This will add your current directory as a volume to the container, set the
 working directory to the volume, and run the command `go build` which will tell
@@ -46,7 +46,7 @@ go to compile the project in the working directory and output the executable to
 `myapp`. Alternatively, if you have a `Makefile`, you can run the `make` command
 inside your container.
 
-    docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp golang:1.3 make
+    docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp golang:1.3 make
 
 ## Cross-compile your app inside the Docker container
 
@@ -54,11 +54,11 @@ If you need to compile your application for a platform other than `linux/amd64`
 (such as `windows/386`), this can be easily accomplished with the provided
 `cross` tags:
 
-    docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp -e GOOS=windows -e GOARCH=386 golang:1.3-cross go build -v
+    docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp -e GOOS=windows -e GOARCH=386 golang:1.3-cross go build -v
 
 Alternatively, you can build for multiple platforms at once:
 
-    docker run --rm -it -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp golang:1.3-cross bash
+    docker run --rm -it -v "$PWD":/usr/src/myapp -w /usr/src/myapp golang:1.3-cross bash
     $ for GOOS in darwin linux; do
     >   for GOARCH in 386 amd64; do
     >     go build -v -o myapp-$GOOS-$GOARCH

httpd/README.md

@@ -46,7 +46,7 @@ Then, run the commands to build and run the Docker image:
 If you don't want to include a `Dockerfile` in your project, it is sufficient to
 do the following:
 
-    docker run -it --rm --name my-apache-app -v "$(pwd)":/usr/local/apache2/htdocs/ httpd:2.4
+    docker run -it --rm --name my-apache-app -v "$PWD":/usr/local/apache2/htdocs/ httpd:2.4
 
 ### Configuration
 

httpd/content.md

@@ -35,7 +35,7 @@ Then, run the commands to build and run the Docker image:
 If you don't want to include a `Dockerfile` in your project, it is sufficient to
 do the following:
 
-    docker run -it --rm --name my-apache-app -v "$(pwd)":/usr/local/apache2/htdocs/ httpd:2.4
+    docker run -it --rm --name my-apache-app -v "$PWD":/usr/local/apache2/htdocs/ httpd:2.4
 
 ### Configuration
 

hylang/README.md

@@ -42,7 +42,7 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Hy script by using the Hy
 Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp hylang:0.10 hy your-daemon-or-script.hy
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp hylang:0.10 hy your-daemon-or-script.hy
 
 # License
 

hylang/content.md

@@ -32,4 +32,4 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Hy script by using the Hy
 Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp hylang:0.10 hy your-daemon-or-script.hy
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp hylang:0.10 hy your-daemon-or-script.hy

java/README.md

@@ -51,7 +51,7 @@ There may be occasions where it is not appropriate to run your app inside a
 container. To compile, but not run your app inside the Docker instance, you can
 write something like:
 
-    docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp java:7 javac Main.java
+    docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp java:7 javac Main.java
 
 This will add your current directory as a volume to the container, set the
 working directory to the volume, and run the command `javac Main.java` which

java/content.md

@@ -36,7 +36,7 @@ There may be occasions where it is not appropriate to run your app inside a
 container. To compile, but not run your app inside the Docker instance, you can
 write something like:
 
-    docker run --rm -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp java:7 javac Main.java
+    docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp java:7 javac Main.java
 
 This will add your current directory as a volume to the container, set the
 working directory to the volume, and run the command `javac Main.java` which

jruby/README.md

@@ -57,7 +57,7 @@ The `onbuid` tag expects a `Gemfile.lock` in your app directory. This `docker
 run` will help you generate one. Run it in the root of your app, next to the
 `Gemfile`:
 
-    docker run --rm -v "$(pwd)":/usr/src/app -w /usr/src/app jruby:1.7 bundle install --system
+    docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app jruby:1.7 bundle install --system
 
 ## Run a single Ruby script
 
@@ -65,7 +65,7 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Ruby script by using the
 Ruby Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp jruby:1.7 jruby your-daemon-or-script.rb
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp jruby:1.7 jruby your-daemon-or-script.rb
 
 # License
 

jruby/content.md

@@ -42,7 +42,7 @@ The `onbuid` tag expects a `Gemfile.lock` in your app directory. This `docker
 run` will help you generate one. Run it in the root of your app, next to the
 `Gemfile`:
 
-    docker run --rm -v "$(pwd)":/usr/src/app -w /usr/src/app jruby:1.7 bundle install --system
+    docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app jruby:1.7 bundle install --system
 
 ## Run a single Ruby script
 
@@ -50,4 +50,4 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Ruby script by using the
 Ruby Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp jruby:1.7 jruby your-daemon-or-script.rb
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp jruby:1.7 jruby your-daemon-or-script.rb

maven/README.md

@@ -49,7 +49,7 @@ For many simple projects, you may find it inconvenient to write a complete
 In such cases, you can run a Maven project by using the Maven Docker image
 directly, passing a Maven command to `docker run`:
 
-    docker run -it --rm --name my-maven-project -v "$(pwd)":/usr/src/mymaven -w /usr/src/mymaven maven:3.2-jdk-7 mvn clean install
+    docker run -it --rm --name my-maven-project -v "$PWD":/usr/src/mymaven -w /usr/src/mymaven maven:3.2-jdk-7 mvn clean install
 
 # License
 

maven/content.md

@@ -34,4 +34,4 @@ For many simple projects, you may find it inconvenient to write a complete
 In such cases, you can run a Maven project by using the Maven Docker image
 directly, passing a Maven command to `docker run`:
 
-    docker run -it --rm --name my-maven-project -v "$(pwd)":/usr/src/mymaven -w /usr/src/mymaven maven:3.2-jdk-7 mvn clean install
+    docker run -it --rm --name my-maven-project -v "$PWD":/usr/src/mymaven -w /usr/src/mymaven maven:3.2-jdk-7 mvn clean install

node/README.md

@@ -64,7 +64,7 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Node.js script by using the
 Node.js Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp node:0.10 node your-daemon-or-script.js
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp node:0.10 node your-daemon-or-script.js
 
 # License
 

node/content.md

@@ -46,4 +46,4 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Node.js script by using the
 Node.js Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp node:0.10 node your-daemon-or-script.js
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp node:0.10 node your-daemon-or-script.js

perl/README.md

@@ -41,7 +41,7 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Perl script by using the
 Perl Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp perl:5.20 perl your-daemon-or-script.pl
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp perl:5.20 perl your-daemon-or-script.pl
 
 # License
 

perl/content.md

@@ -28,4 +28,4 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Perl script by using the
 Perl Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp perl:5.20 perl your-daemon-or-script.pl
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp perl:5.20 perl your-daemon-or-script.pl

php/README.md

@@ -54,7 +54,7 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a PHP script by using the PHP
 Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp php:5.6-cli php your-script.php
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp php:5.6-cli php your-script.php
 
 ## With Apache
 
@@ -109,7 +109,7 @@ you can use the `docker-php-ext-configure` script like this example.
 If you don't want to include a `Dockerfile` in your project, it is sufficient to
 do the following:
 
-    docker run -it --rm --name my-apache-php-app -v "$(pwd)":/var/www/html php:5.6-apache
+    docker run -it --rm --name my-apache-php-app -v "$PWD":/var/www/html php:5.6-apache
 
 # License
 

php/content.md

@@ -36,7 +36,7 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a PHP script by using the PHP
 Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp php:5.6-cli php your-script.php
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp php:5.6-cli php your-script.php
 
 ## With Apache
 
@@ -91,4 +91,4 @@ you can use the `docker-php-ext-configure` script like this example.
 If you don't want to include a `Dockerfile` in your project, it is sufficient to
 do the following:
 
-    docker run -it --rm --name my-apache-php-app -v "$(pwd)":/var/www/html php:5.6-apache
+    docker run -it --rm --name my-apache-php-app -v "$PWD":/var/www/html php:5.6-apache

pypy/README.md

@@ -55,11 +55,11 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Python script by using the
 Python Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp pypy:3 pypy3 your-daemon-or-script.py
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp pypy:3 pypy3 your-daemon-or-script.py
 
 or (again, if you need to use Python 2):
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp pypy:2 pypy your-daemon-or-script.py
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp pypy:2 pypy your-daemon-or-script.py
 
 # License
 

pypy/content.md

@@ -40,8 +40,8 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Python script by using the
 Python Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp pypy:3 pypy3 your-daemon-or-script.py
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp pypy:3 pypy3 your-daemon-or-script.py
 
 or (again, if you need to use Python 2):
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp pypy:2 pypy your-daemon-or-script.py
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp pypy:2 pypy your-daemon-or-script.py

python/README.md

@@ -62,11 +62,11 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Python script by using the
 Python Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp python:3 python your-daemon-or-script.py
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp python:3 python your-daemon-or-script.py
 
 or (again, if you need to use Python 2):
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp python:2 python your-daemon-or-script.py
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp python:2 python your-daemon-or-script.py
 
 # License
 

python/content.md

@@ -41,8 +41,8 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Python script by using the
 Python Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp python:3 python your-daemon-or-script.py
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp python:3 python your-daemon-or-script.py
 
 or (again, if you need to use Python 2):
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp python:2 python your-daemon-or-script.py
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp python:2 python your-daemon-or-script.py

r-base/README.md

@@ -31,7 +31,7 @@ R is a GNU project. The source code for the R software environment is written
 primarily in C, Fortran, and R. R is freely available under the GNU General
 Public License, and pre-compiled binary versions are provided for various
 operating systems. R uses a command line interface; however, several
-graphical user interfaces are available for use with R. 
+graphical user interfaces are available for use with R.
 
 > [R FAQ](http://cran.r-project.org/doc/FAQ/R-FAQ.html#What-is-R_003f)
 > [wikipedia.org/wiki/R_(programming_language)](http://en.wikipedia.org/wiki/R_(programming_language))
@@ -52,7 +52,7 @@ Link the working directory to run R batch commands. We recommend specifying a
 non-root user when linking a volume to the container to avoid permission
 changes, as illustrated here:
 
-    docker run -ti --rm -v $(pwd):/home/docker -w /home/docker -u docker r-base R CMD check .
+    docker run -ti --rm -v "$PWD":/home/docker -w /home/docker -u docker r-base R CMD check .
 
 Alternatively, just run a bash session on the container first.  This allows a
 user to run batch commands and also edit and run scripts:
@@ -112,7 +112,7 @@ You are invited to contribute new features, fixes, or updates, large or small;
 we are always thrilled to receive pull requests, and do our best to process them
 as fast as we can.
 
-Before you start to code, we recommend discussing your plans 
+Before you start to code, we recommend discussing your plans
 through a [GitHub issue](https://github.com/rocker-org/rocker/issues), especially for more ambitious
 contributions. This gives other contributors a chance to point you in the right
 direction, give you feedback on your design, and help you find out if someone

r-base/content.md

@@ -21,7 +21,7 @@ R is a GNU project. The source code for the R software environment is written
 primarily in C, Fortran, and R. R is freely available under the GNU General
 Public License, and pre-compiled binary versions are provided for various
 operating systems. R uses a command line interface; however, several
-graphical user interfaces are available for use with R. 
+graphical user interfaces are available for use with R.
 
 > [R FAQ](http://cran.r-project.org/doc/FAQ/R-FAQ.html#What-is-R_003f)
 > [wikipedia.org/wiki/R_(programming_language)](http://en.wikipedia.org/wiki/R_(programming_language))
@@ -42,7 +42,7 @@ Link the working directory to run R batch commands. We recommend specifying a
 non-root user when linking a volume to the container to avoid permission
 changes, as illustrated here:
 
-    docker run -ti --rm -v $(pwd):/home/docker -w /home/docker -u docker r-base R CMD check .
+    docker run -ti --rm -v "$PWD":/home/docker -w /home/docker -u docker r-base R CMD check .
 
 Alternatively, just run a bash session on the container first.  This allows a
 user to run batch commands and also edit and run scripts:

rails/README.md

@@ -53,14 +53,14 @@ The `onbuid` tag expects a `Gemfile.lock` in your app directory. This `docker
 run` will help you generate one. Run it in the root of your app, next to the
 `Gemfile`:
 
-    docker run --rm -v "$(pwd)":/usr/src/app -w /usr/src/app ruby:2.1 bundle install
+    docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app ruby:2.1 bundle install
 
 ## Bootstrap a new Rails application
 
 If you want to generate the scaffolding for a new Rails project, you can do the
 following:
 
-    docker run -it --rm --user "$(id -u):$(id -g)" -v "$(pwd)":/usr/src/app -w /usr/src/app rails rails new webapp
+    docker run -it --rm --user "$(id -u):$(id -g)" -v "$PWD":/usr/src/app -w /usr/src/app rails rails new webapp
 
 This will create a sub-directory named `webapp` inside your current directory.
 

rails/content.md

@@ -42,13 +42,13 @@ The `onbuid` tag expects a `Gemfile.lock` in your app directory. This `docker
 run` will help you generate one. Run it in the root of your app, next to the
 `Gemfile`:
 
-    docker run --rm -v "$(pwd)":/usr/src/app -w /usr/src/app ruby:2.1 bundle install
+    docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app ruby:2.1 bundle install
 
 ## Bootstrap a new Rails application
 
 If you want to generate the scaffolding for a new Rails project, you can do the
 following:
 
-    docker run -it --rm --user "$(id -u):$(id -g)" -v "$(pwd)":/usr/src/app -w /usr/src/app rails rails new webapp
+    docker run -it --rm --user "$(id -u):$(id -g)" -v "$PWD":/usr/src/app -w /usr/src/app rails rails new webapp
 
 This will create a sub-directory named `webapp` inside your current directory.

rethinkdb/README.md

@@ -29,7 +29,7 @@ will bind to all network interfaces available to the container (by default,
 RethinkDB only accepts connections from `localhost`).
 
 ```bash
-docker run --name some-rethink -v "$(pwd):/data" -d rethinkdb
+docker run --name some-rethink -v "$PWD:/data" -d rethinkdb
 ```
 
 ## Connect the instance to an application

rethinkdb/content.md

@@ -16,7 +16,7 @@ will bind to all network interfaces available to the container (by default,
 RethinkDB only accepts connections from `localhost`).
 
 ```bash
-docker run --name some-rethink -v "$(pwd):/data" -d rethinkdb
+docker run --name some-rethink -v "$PWD:/data" -d rethinkdb
 ```
 
 ## Connect the instance to an application

ruby/README.md

@@ -55,7 +55,7 @@ The `onbuid` tag expects a `Gemfile.lock` in your app directory. This `docker
 run` will help you generate one. Run it in the root of your app, next to the
 `Gemfile`:
 
-    docker run --rm -v "$(pwd)":/usr/src/app -w /usr/src/app ruby:2.1 bundle install
+    docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app ruby:2.1 bundle install
 
 ## Run a single Ruby script
 
@@ -63,7 +63,7 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Ruby script by using the
 Ruby Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp ruby:2.1 ruby your-daemon-or-script.rb
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp ruby:2.1 ruby your-daemon-or-script.rb
 
 # License
 

ruby/content.md

@@ -34,7 +34,7 @@ The `onbuid` tag expects a `Gemfile.lock` in your app directory. This `docker
 run` will help you generate one. Run it in the root of your app, next to the
 `Gemfile`:
 
-    docker run --rm -v "$(pwd)":/usr/src/app -w /usr/src/app ruby:2.1 bundle install
+    docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app ruby:2.1 bundle install
 
 ## Run a single Ruby script
 
@@ -42,4 +42,4 @@ For many simple, single file projects, you may find it inconvenient to write a
 complete `Dockerfile`. In such cases, you can run a Ruby script by using the
 Ruby Docker image directly:
 
-    docker run -it --rm --name my-running-script -v "$(pwd)":/usr/src/myapp -w /usr/src/myapp ruby:2.1 ruby your-daemon-or-script.rb
+    docker run -it --rm --name my-running-script -v "$PWD":/usr/src/myapp -w /usr/src/myapp ruby:2.1 ruby your-daemon-or-script.rb

thrift/README.md

@@ -24,7 +24,7 @@ This is image is intended to run as an executable. Files are provided
 by mounting a directory. Here's an example of compiling
 `service.thrift` to ruby to the current directory.
 
-    docker run -v "$(pwd):/data" thrift thrift -o /data --gen rb /data/service.thrift
+    docker run -v "$PWD:/data" thrift thrift -o /data --gen rb /data/service.thrift
 
 Note, that you may want to include `-u $(id -u)` to set the UID on
 generated files. The thrift process runs as root by default which will

thrift/content.md

@@ -14,7 +14,7 @@ This is image is intended to run as an executable. Files are provided
 by mounting a directory. Here's an example of compiling
 `service.thrift` to ruby to the current directory.
 
-    docker run -v "$(pwd):/data" thrift thrift -o /data --gen rb /data/service.thrift
+    docker run -v "$PWD:/data" thrift thrift -o /data --gen rb /data/service.thrift
 
 Note, that you may want to include `-u $(id -u)` to set the UID on
 generated files. The thrift process runs as root by default which will