Is it possible to see live output of command runned by execute_process?

Question

I'm running some time consuming bash script:

execute_process(
    COMMAND "bash" "slow_script.sh"
    WORKING_DIRECTORY ${INSTALL_SCRIPT_DIR}
    ERROR_VARIABLE ERROR_MESSAGE
    RESULT_VARIABLE ERROR_CODE)

and I want to see progress. I tried to show xterm window:

execute_process(
    COMMAND "xterm" "-e" "slow_script.sh"
    WORKING_DIRECTORY ${INSTALL_SCRIPT_DIR}
    ERROR_VARIABLE ERROR_MESSAGE
    RESULT_VARIABLE ERROR_CODE)

It works, but seems ugly.

Is it possible to show script output in CMake output while script is executing?

Perhaps have a look at `tee`. You can also reroute `stderr` to, for example, `stdout` with `my command blah blah ... 2>&1`. — lurker, Jul 13 '18 at 13:51

score 2 · Accepted Answer · answered Jul 13 '18 at 20:36

2

Probably you could use some of the standard /dev devices as OUTPUT_FILE.

The following CMake example worked with a quick test on my Ubuntu machine:

cmake_minimum_required(VERSION 2.4)

project(TestExecuteProcessToStdOut NONE)

execute_process(
    COMMAND "${CMAKE_COMMAND}" -E echo "Test"
    ERROR_VARIABLE ERROR_MESSAGE
    RESULT_VARIABLE ERROR_CODE
    OUTPUT_FILE "/proc/self/fd/0"
)

References

answered Jul 13 '18 at 20:36

Florian

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It works, thanks! BTW this solution, for some reason, has no effect in QtCreator. – yrHeTateJlb Jul 16 '18 at 08:09
What about windows ? Any idea ? – alcoforado Mar 13 '20 at 04:27

Is it possible to see live output of command runned by execute_process?

1 Answers1