Function

Package

system

Signature

call-system-showing-output command &key current-directory prefix show-cmd output-stream wait shell-type kill-process-on-abort => status

Arguments

command

A string, a list of strings, a simple-vector of strings, or nil.

current-directory

A string. Supported only on Microsoft Windows.

prefix

A string.

show-cmd

A boolean.

output-stream

An output stream or nil, t or :tty.

wait

A boolean.

shell-type

A string. Supported only on non-Windows platforms.

kill-process-on-abort

A generalized boolean.

Values

status

The exit status of the invoked shell or process.

Description

call-system-showing-output is an extension to call-system which allows output to be redirected. On non-Windows platforms this means it can be redirected to places other than the shell process from which the LispWorks image was invoked. call-system-showing-output therefore allows the user to, for example, invoke a shell command and redirect the output to the current Listener window.

The argument command is interpreted as by call-system. On Microsoft Windows there is one difference: when command is a list or vector and the executable (that is, the first element of the sequence command) in call-system-showing-output is not a GUI application, LispWorks hides the first window, which is the console that the executable will normally open. Note that for a non-direct command (that is, a string) LispWorks always hides the first window (which is the console) in both call-system and call-system-showing-output.

prefix is a prefix to be printed at the start of any output line. The default value is "; ".

show-cmd specifies whether or not the cmd invoked will be printed as well as the output for that command. If t then cmd will be printed. The default value for show-cmd is t.

output-stream specifies where the output will be sent to. If output-stream is an output stream, the output is written to it. If output-stream is t, the output is written to *standard-output*. If output-stream is nil, the output is collected as a string, and returned as a second value from call-system-showing-output. If output-stream is :tty, call-system-showing-output behaves like call-system. The default value is *standard-output*.

If wait is true, call-system-showing-output does not return until the process has exited. If nil, call-system-showing-output returns immediately and no output is shown. The default for wait is t.

shell-type is a string naming a UNIX shell. The default is "/bin/sh".

If kill-process-on-abort is true, then when call-system-showing-output is aborted the process is killed. The default value of kill-process-on-abort is nil.

call-system-showing-output returns the exit status of the shell invoked to execute the command on non-Windows platforms, or the process created on Microsoft Windows.

Examples

On Linux:

CL-USER 1 > (sys:call-system-showing-output "pwd" :prefix "***")

***pwd

***/amd/xanfs1-cam/u/ldisk/sp/lispsrc/v42/builds

0

CL-USER 2 > (sys:call-system-showing-output "pwd" :prefix "&&&" :show-cmd nil)

&&&/amd/xanfs1-cam/u/ldisk/sp/lispsrc/v42/builds

0

On Microsoft Windows:

CL-USER 223 > (sys:call-system-showing-output

                        "cmd /c type hello.txt"

                        :prefix "***")

***cmd /c type hello.txt

***Hi there

0

CL-USER 224 > (sys:call-system-showing-output

                        "cmd /c type hello.txt"

                        :prefix "&&&"

                        :show-cmd nil)

&&&Hi there

0

See also

call-system
open-pipe
run-shell-command