exec(3) [php man page]

EXEC(3) 								 1								   EXEC(3)

exec - Execute an external program

SYNOPSIS

       string exec (string  $command, [array  &$output], [int  &$return_var])

DESCRIPTION

       exec(3) executes the given $command.

PARAMETERS

	      o $command
		- The command that will be executed.

	      o $output
		- If the $output argument is present, then the specified array will be filled with every line of output from the command. Trailing
		whitespace, such as 
, is not included in this array. Note that if the array already contains some elements, exec(3) will  append
		to  the  end  of  the  array.  If you do not want the function to append elements, call unset(3) on the array before passing it to
		exec(3).

	      o $return_var
		- If the $return_var argument is present along with the $output argument, then the return status of the executed command  will	be
		written to this variable.

RETURN VALUES

	The last line from the result of the command. If you need to execute a command and have all the data from the command passed directly back
       without any interference, use the passthru(3) function.

	To get the output of the executed command, be sure to set and use the $output parameter.

EXAMPLES

       Example #1

	      An exec(3) example

	      <?php
	      // outputs the username that owns the running php/httpd process
	      // (on a system with the "whoami" executable in the path)
	      echo exec('whoami');
	      ?>

NOTES

       Warning

	      When allowing user-supplied data to be passed to this function, use escapeshellarg(3) or escapeshellcmd(3) to ensure that users can-
	      not trick the system into executing arbitrary commands.

       Note

	      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.

       Warning

	      With safe mode enabled, the command string is escaped with escapeshellcmd(3). Thus, echo y | echo x becomes echo y | echo x.

SEE ALSO

       system(3), passthru(3), escapeshellcmd(3), pcntl_exec(3), backtick operator.

PHP Documentation Group 														   EXEC(3)

DH-EXEC-INSTALL(1)						      dh-exec							DH-EXEC-INSTALL(1)

NAME

       dh-exec-install - Install (and possibly rename) files.

SYNOPSIS

       #! /usr/bin/dh-exec
       debian/default.conf => /etc/my-package/start.conf
       usr/bin/*

DESCRIPTION

       Being a sub-command of dh-exec(1), this program must not be ran directly, but through dh-exec, which automatically runs all available
       sub-commands if run bare; or explicitly with dh-exec --with=install.

       It is meant to be used for dh_install(1) files, and those alone. If it finds that its input is not such a file, it will do nothing, but
       echo back the contents.

       The purpose of the program is to extend dh_install(1)'s functionality, by allowing to specify a destination filename.

       This can be accomplished by a special syntax: the " => " mark between a source and a destination means that the source file should be
       installed with the specified destination name.

       For obvious reasons, the source must not be a wildcard, and the destination in this case must be a file, and not a directory.

       All other non-comment lines are left alone.

RESTRICTIONS

       Due to the way executable scripts are called from debhelper(1), there is no way to know what options were used for the original
       dh_install(1). This means, that the --sourcedir option of dh_install(1) will not work correctly when dh-exec-install is in use.

IMPLEMENTATION

       Internally, the renaming happens by creating a temporary directory under debian/tmp/, and copying (or moving, if the source was under
       debian/tmp/ to begin with) the file there, with the new name.

       This is done this way to allow dh_install(1) to do the real copying, and allow its options to continue working, even when renaming is
       involved.

       The temporary directory is put under debian/tmp so that it will be cleaned by dh_prep(1) when the clean target gets to run. Thus, no extra
       code is needed anywhere to clean up the renamed files.

ENVIRONMENT

       DH_EXEC_SCRIPTDIR
	   Indicates which directory the command-specific scripts should be sought for. If not specified, scripts will be searched for in
	   /usr/share/dh-exec/.

FILES

       $DH_EXEC_SCRIPTDIR/dh-exec-install-*
	   The various scripts for the higher-level program.

SEE ALSO

       debhelper(1), dh-exec(1), dh_install(1)

AUTHOR

       dh-exec-install is copyright (C) 2011-2012 by Gergely Nagy <algernon@madhouse-project.org>.

								    2012-05-03							DH-EXEC-INSTALL(1)