How to use

exec

method

in

processing.core.PApplet

/**
 * Launch a process using a platforms shell. This version uses an array
 * to make it easier to deal with spaces in the individual elements.
 * (This avoids the situation of trying to put single or double quotes
 * around different bits).
 */
static public Process open(String argv[]) {
  return exec(argv);
}

 return exec(args);
} else {
 params = concat(params, args);
 return exec(params);
return exec(args);

Process p = exec(args);
int result = -1;
try {

Process p = exec("defaults", "read", "com.apple.spaces", "spans-displays");
BufferedReader outReader = createReader(p.getInputStream());
BufferedReader errReader = createReader(p.getErrorStream());

/**
 * Same as exec() above, but prefixes the call with a shell.
 */
static public int shell(StringList stdout, StringList stderr, String... args) {
 String shell;
 String runCmd;
 StringList argList = new StringList();
 if (platform == WINDOWS) {
  shell = System.getenv("COMSPEC");
  runCmd = "/C";
 } else {
  shell = "/bin/sh";
  runCmd = "-c";
  // attempt emulate the behavior of an interactive shell
  // can't use -i or -l since the version of bash shipped with macOS does not support this together with -c
  // also we want to make sure no motd or similar gets returned as stdout
  argList.append("if [ -f /etc/profile ]; then . /etc/profile >/dev/null 2>&1; fi;");
  argList.append("if [ -f ~/.bash_profile ]; then . ~/.bash_profile >/dev/null 2>&1; elif [ -f ~/.bash_profile ]; then . ~/.bash_profile >/dev/null 2>&1; elif [ -f ~/.profile ]; then ~/.profile >/dev/null 2>&1; fi;");
 }
 for (String arg : args) {
  argList.append(arg);
 }
 return exec(stdout, stderr, shell, runCmd, argList.join(" "));
}