Hello world

As we all know, showing that we can print "Hello world" is more important than showing that the language is Turing complete.

Create a simple program and execute it. File test_01.bds

#!/usr/bin/env bds

print "Hello world\n"

$ ./test_01.bds 
Hello world

Run a shell command

This time we do it by running a system command (echo), using bds' sys expression. A sys executes the command immediately in the local computer and waits until the command finishes. Everything after sys until the end of the line is interpreted as an OS command. File test_02.bds

#!/usr/bin/env bds

sys echo Hello world

Run it:

$ ./test_02.bds 
hello world

Run a shell command on a cluster

now let's run the same in as a 'task'. tasks schedule the system command for execution (either locally, on a cluster, etc.). File test_03.bds

#!/usr/bin/env bds

task echo Hello world

Just run the script to execute tasks locally

$ ./test_03.bds
Hello world

You can also execute on a cluster, for instance, if you are on a cluster's head node, just run:

$ bds -s cluster ./test_03.bds
Hello world

Note that in order to execute on another architecture (cluster), we did not change the bds program, we just added a command line option.

Cluster, cloud, datacenter or local computer

Programs can be executed on different computer systems of different sizes without changing the code.