GoLang system

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GoLang replacement for PHP's system [edit | history]
// requires package os/exec

func system(params ...interface{}) string {

    // First argument is command to execute (string)
    // Optional 2nd argument is bool true for windows (vs linux/mac)
    // Returns string, empty if no error, otherwise error string

    var cmd *exec.Cmd

    cmdstring := params[0].(string)
    windows := false

    if len(params) > 1 {    // boolean, windows, default false
        windows = params[1].(bool)

    if (!windows) {
        cmd = exec.Command("/bin/sh", "-c", cmdstring)
    } else {
        cmd = exec.Command("cmd.exe", "/C", cmdstring)
    cmd.Stdout = os.Stdout
    cmd.Stderr = os.Stderr
    cmd.Stdin = os.Stdin
    err := cmd.Run()
    if (err == nil) {
        return ""
    } else {
        return err.Error()

PHP system

PHP original manual for system [ show | php.net ]


(PHP 4, PHP 5, PHP 7)

systemExecute an external program and display the output


string system ( string $command [, int &$return_var ] )

system() is just like the C version of the function in that it executes the given command and outputs the result.

The system() call also tries to automatically flush the web server's output buffer after each line of output if PHP is running as a server module.

If you need to execute a command and have all the data from the command passed directly back without any interference, use the passthru() function.



The command that will be executed.


If the return_var argument is present, then the return status of the executed command will be written to this variable.

Return Values

Returns the last line of the command output on success, and FALSE on failure.


Example #1 system() example

echo '<pre>';

// Outputs all the result of shellcommand "ls", and returns
// the last output line into $last_line. Stores the return value
// of the shell command in $retval.
$last_line system('ls'$retval);

// Printing additional info
echo '
<hr />Last line of the output: ' 
$last_line '
<hr />Return value: ' 



When allowing user-supplied data to be passed to this function, use escapeshellarg() or escapeshellcmd() to ensure that users cannot trick the system into executing arbitrary commands.


If a program is started with this function, in order for it to continue running in the background, the output of the program must be redirected to a file or another output stream. Failing to do so will cause PHP to hang until the execution of the program ends.

Note: When safe mode is enabled, you can only execute files within the safe_mode_exec_dir. For practical reasons, it is currently not allowed to have .. components in the path to the executable.


With safe mode enabled, the command string is escaped with escapeshellcmd(). Thus, echo y | echo x becomes echo y \| echo x.

See Also