pipe-shell-command(2)

NAME

pipe-shell-command - Execute a single operating system command
$ME_PIPE_STDERR - Command line diversion to stderr symbol

SYNOPSIS

n pipe-shell-command "command" [ "buffer-name" | "variable-name" ] (esc @) 

[MS-DOS and Win32s Only]
$ME_PIPE_STDERR "string"; Default is undefined.

DESCRIPTION

pipe-shell-command executes one operating system command command and pipes the resulting output into a buffer with the name of *command*. The $result(5) variable is set the return or exit-code of the shell command and can be used to test the result.

The argument n can be used to change the default behavior of pipe-shell-command described above, n is a bit based flag where:-

0x01


Enables the use of the default buffer name *command* (default). If this bit is clear the user must supply a buffer name. This enables another command to be started without effecting any other command buffer.

0x02


Hides the output buffer, default action pops up a window and displays the output buffer in the new window.

0x04


Disable the use of the command-line processor to launch the program (windows versions only). By default the "command" is launched by executing the command:

    %COMSPEC% /c command 

Where %COMSPEC% is typically command.com. If this bit is set, the "command" is launched directly.

0x08


Detach the launched process from MicroEmacs (windows versions only). By default the command is launched as a child process of MicroEmacs with a new console. With this bit set the process is completely detached from MicroEmacs instead.

0x10


Disable the command name mangling (windows versions only). By default any '/' characters found in the command name (the first argument only) are converted to '\' characters to make it Windows compliant.

0x20


Displays the new process window (windows versions only), by default the window is hidden.

0x40


Raw mode, disable text annotation at the start of the pipe output.

0x80


Not used by this command.

0x100


When set the command-line to be run is the first line of buffer string, this feature can be used to overcome the default 1024 character command-line limit. When a multiple-line command-line is required, a negative argument can be given to insert-string(2).

0x200


Not used by this command.

0x400


When this bit is set the command sets the value of the given variable-name to the output of the shell command rather than insert it into a buffer. Note that the output length is limited to the maximum variable length, typically 1024 or 2048 bytes, and the output is copied verbatim so a '\0' in the output will terminate the value.

NOTES

On MS-DOS and Win32s the standard shell command.com(1) does not support the piping of stderr to a file. Other shells, such as 4Dos.com(1), do, using the command-line argument ">&". If the environment variable "ME_PIPE_STDERR" is defined (the value is not used) then MicroEmacs assumes that the current shell supports piping of stderr.

SEE ALSO

ipipe-shell-command(2), shell-command(2).

(c) Copyright JASSPA 2025
Last Modified: 2024/07/16
Generated On: 2025/09/29