Online PHP Function(s){ #Test PHP functions online!; }

  •  
 

escapeshellcmd

(PHP 4, PHP 5)

escapeshellcmdEscape shell metacharacters

Description

string escapeshellcmd ( string $command )

escapeshellcmd() escapes any characters in a string that might be used to trick a shell command into executing arbitrary commands. This function should be used to make sure that any data coming from user input is escaped before this data is passed to the exec() or system() functions, or to the backtick operator.

Following characters are preceded by a backslash: #&;`|*?~<>^()[]{}$\, \x0A and \xFF. ' and " are escaped only if they are not paired. In Windows, all these characters plus % are replaced by a space instead.

More info
Hide info

Parameters

command

The command that will be escaped.

Return Values

The escaped string.

Examples

Example #1 escapeshellcmd() example

<?php
// We allow arbitrary number of arguments intentionaly here.
$command './configure '.$_POST['configure_options'];

$escaped_command escapeshellcmd($command);
 
system($escaped_command);
?>

Warning

escapeshellcmd() should be used on the whole command string, and it still allows the attacker to pass arbitrary number of arguments. For escaping a single argument escapeshellarg() should be used instead.

See Also

  • escapeshellarg() - Escape a string to be used as a shell argument
  • exec() - Execute an external program
  • popen() - Opens process file pointer
  • system() - Execute an external program and display the output
  • backtick operator

 
 

Execute escapeshellcmd( string $string );

$string =


Php Version:


Output:




 

 

 


Comments

 
 
      © 2017 OnlinePHPFunctions.com | Disclaimer |       PHP versions: 7.1.0, 7.0.14, 7.0.5, 7.0.4, 7.0.3, 7.0.2, 7.0.1, 5.6.29, 5.6.20, 5.6.19, 5.6.18, 5.6.17, 5.6.2, 5.5.34, 5.5.33, 5.5.32, 5.5.31, 5.5.18, 5.5.5, 5.5.0.a6, 5.5.0.a.5, 5.5.0.a.2, 5.4.34, 5.4.21, 5.4.13, 5.4.12, 5.4.11, 5.4.10, 5.4.9, 5.4.8, 5.4.7, 5.4.6, 5.4.5, 5.4.4, 5.4.3, 5.4.2, 5.4.1, 5.4.0, 5.3.29, 5.3.27, 5.3.23, 5.3.22, 5.3.21, 5.3.20, 5.3.19, 5.3.18, 5.3.17, 5.3.16, 5.3.15, 5.3.14, 5.3.13, 5.3.12, 5.3.11, 5.3.10, 5.3.2, 5.3.1, 5.3.0, 5.2.17, 5.2.16, 5.1.6, 5.1.5, 5.0.5, 5.0.4, 4.4.9