$ git clone -b 1.x https://github.com/gmkurtzer/singularity.gi

$ cd singularity
$ sh ./autogen.sh
$ ./configure --prefix=/usr/local
$ make
$ sudo make install
$ sudo make install-perms

<example.sspec>
Name: echo
Exec: /bin/echo
<example.sspec>

<Listing 1>
$ singularity build example.sspec
<Listing 1>

$ ./echo.sapp "hello world"

$ /bin/echo "hello world"

<.sspec file>
Name: grep
Exec: /bin/grep
<.sspec file>

$ singularity --quiet build example.sspec

$ cat example.sspec | ./grep.sapp -i name

$ ./grep.sapp -i name example.sspec

<Listing 2>
> vi foo.txt
> more foo.txt
> ls -s
> grep everyday foo.txt
> ./grep.sapp everyday foo.txt
<Listing 2>

$ git clone https://github.com/open-mpi/ompi.git

<Listing 3>
> cd ompi
> sh ./autogen.pl
> ./configure --prefix=/usr/local
> make
> sudo make install
<Listing 3>

<Listing 4>
!  Fortran example
   program hello
   include 'mpif.h'
   integer rank, size, ierror, tag, status(MPI_STATUS_SIZE)
   call MPI_INIT(ierror)
   call MPI_COMM_SIZE(MPI_COMM_WORLD, size, ierror)
   call MPI_COMM_RANK(MPI_COMM_WORLD, rank, ierror)
   print*, 'node', rank, ': Hello world'
   call MPI_FINALIZE(ierror)
   end
<Listing 4>

> mpirun -np 4 -hostfile ./hostfile ./hello

> ls -sh

> mpirun -np 4 -hostfile ./hostfile hello_mpi.sapp