// -*- javascript -*-

// hello world
// print a simple string on stdout
System.print("Hello World\n")

// argv
// access command line parameters (no segmentation fault accepted, nor silent exception, so some languages must explicitly check the presence of the argument)
System.print(ARGS[1], "\n")

// env
// access environment variable
System.print(System.getenv("HOME"), "\n")

// test file exists
// return exit code error (non zero) if a file does not exist
if (!new File("/etc/mtab").exists()) System.exit(1)

// test file readable
// return exit code error (non zero) if a file is not readable
if (!new File("/etc/mtab").open("r")) System.exit(1)

// formatting
// print integers in a simple formatted string
a=1; b=2; System.print(a, " + ", b, " = ", a + b, "\n")

// system
// call an external program and check the return value
if (System.system("false") != 0) System.error("false failed\n")
System.system("echo done")