CFEngine
Hello, world code example:
#!/usr/bin/env cf-agent
# without --no-lock option to cf-agent
# this output will only occur once per minute
# this is by design.
bundle agent main
{
reports:
"Hello world!";
}
Popularity: Less than 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.