# -*- lua -*-

# hello world
# print a simple string on stdout
print "Hello world"

# argv
# access command line parameters (no segmentation fault accepted, nor silent exception, so some languages must explicitly check the presence of the argument)
print(arg[1])

# env
# access environment variable
print(getenv"HOME")

# test file readable
# return exit code error (non zero) if a file is not readable
if not openfile("/etc/mtab", "r") then exit(1) end

# formatting
# print integers in a simple formatted string
a=1; b=2; print(a .. " + " .. b .. " = " .. a + b)

# system
# call an external program and check the return value
if execute "false" ~= 0 then _ALERT "false failed\n" end
execute "echo done"