Im launch ubuntu что это
Provided by: im-config_0.24-1ubuntu4_all
NAME
im-launch - launch input method end execute session program
SYNOPSIS
im-launch SESSION-PROGRAM
DESCRIPTION
The im-launch command is used to start a input method framework server daemon such as ibus-daemon, set up the appropriate environment variables for the client programs, and execute SESSION-PROGRAM such as x-session-manager. This command is usually not invoked from the console of a normal user but is normally invoked by the /etc/X11/Xsession.d/70im-config_launch.
TROUBLESHOOT
If you have any problem, see the first part of ~/.xsession-errors and look for the cause. If you are running im-config while Debian (sid) system is undergoing a major library transition, you may need to manually set up ~/.xinputrc with adjusted library version number etc. Please file a bug report to the im-config package using reportbug(1) describing your resolution experience.
SEE ALSO
im-config(8), /usr/share/doc/im-config/README.Debian.gz
AUTHOR
This manual page was written by Aron Xu aron@debian.org>, and Osamu Aoki osamu@debian.org> for the Debian GNU/Linux system (but may be used by others). IM-LAUNCH(1)
© 2019 Canonical Ltd. Ubuntu and Canonical are registered trademarks of Canonical Ltd.
Thread: What is im-launch ?
Gee! These Aren’t Roasted! 
Join Date May 2010 Location USA Beans 128 —> Beans 128
What is im-launch ?
I have been using Xubuntu for years and installed 19.10 yesterday.
I noticed a new autostart setting called «im-launch». It executes the following command:
sh -c 'if ! [ -e "/usr/bin/ibus-daemon" ] && [ "x$XDG_SESSION_TYPE" = "xwayland" ] ; then exec env IM_CONFIG_CHECK_ENV=1 im-launch true; fi'
What is this for? What will happen if I disable it?
October 18th, 2019 #2
Hooked on Manjaro 
Join Date Feb 2010 Location In My Food Forest Beans 9,318 —> Beans 9,318
Re: What is im-launch ?
Here’s the manpage for it. http://manpages.ubuntu.com/manpages/. -launch.1.html
Cheers & Beers, uRock
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im-launch in Ubuntu startup
I found this im-launch startup entry after installing Ubuntu 19.10 which executes sh -c ‘if ! [ -e «/usr/bin/ibus-daemon» ] && [ «x$XDG_SESSION_TYPE» = «xwayland» ] ; then exec env IM_CONFIG_CHECK_ENV=1 im-launch true; fi’ I want to know the purpose of this entry and what would happend if i disabled it ?
- startup
- startup-applications
asked Nov 29, 2019 at 14:57
882 3 3 gold badges 9 9 silver badges 20 20 bronze badges
4 Answers 4
-e check the file /usr/bin/ibus-daemon exists or not? exist means true does not exist means false.
! wants to confirm above value is false if above value is true, it will not execute anything.
[ «x$XDG_SESSION_TYPE» = «xwayland» ] this can have either one of below values based on how you choose to login at the login screen. which session you will choose x11 or wayland.
«xx11» = «xwayland» «xwayland» = «xwayland»
example output of $XDG_SESSION_TYPE
administrator@pratap:~$ echo $XDG_SESSION_TYPE x11 administrator@pratap:~$ echo $XDG_SESSION_TYPE wayland administrator@pratap:~$ if the first expression is false and x$XDG_SESSION_TYPE = xwayland then exec the command env IM_CONFIG_CHECK_ENV=1 im-launch true
if the first expression is true or x$XDG_SESSION_TYPE is not equal to xwayland then don’t do anything.
! EXPRESSION EXPRESSION is false -e FILE FILE exists
you can read more about what this command does then exec env IM_CONFIG_CHECK_ENV=1 im-launch true;
see man env & man im-launch
By default in Ubuntu 19.10 /usr/bin/ibus-daemon exists. so the command will not be executed.
env IM_CONFIG_CHECK_ENV=1 im-launch true when there is the file /usr/bin/ibus-daemon and my session is x11
here is something about IM
when there is no file /usr/bin/ibus-daemon and my session is wayland
here is the thing which is different from above, which means the env is applied and then a chain reaction followed.
so, if you disable or enable this from startup list nothing happens unless no existence of this file /usr/bin/ibus-daemon and your session is wayland conditions are met.
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answered Nov 29, 2019 at 15:23
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Thank you . I appreciate your detailed answer for my doubt . People like you makes askubuntu.com awesome .
Nov 30, 2019 at 9:21
Well, I can underdstand the syntax of the command — but in simple words: what does it do in the end? What is im-launch ?
Apr 24, 2020 at 6:56
I know how to use manpages. But man im-launch does not enlighten me. It seems very low level. Why does Ubuntu put this into my user-space start programs?
Apr 24, 2020 at 6:59
its kind of thing related to multi languages, keyboard layouts.. specially some kind of chinees, japanees.. etc.
Apr 24, 2020 at 7:01
I agree with foobar. I left being puzzled, I had to spend 25 minutes of reading the comment again and again till I get the aha! moment. It is a good, detailed answer, but not a beginner-wise. Thanks anyway for the effort.
Jan 31, 2021 at 22:57
I was doing some research on how to configure Ubuntu to make it more performant and ended up here, which is interesting.
My im-launch startup entry:
sh -c 'if [ "x$XDG_SESSION_TYPE" = "xwayland" ] ; then exec env IM_CONFIG_CHECK_ENV=1 im-launch true; fi' As answer was detailed by @UnKNOWn but @foobar’s comment was my situation, so I took a deep dive.
Breaking The Command Down:
sh is a command language interpreter that executes commands read from a command line string, the standard input, or a specified file.
exec command in Linux is used to execute a command from the bash itself.
if CONDITION true THEN execute COMMAND
im-launch command is used to start a input method framework server daemon such a ibus-daemon, set up the appropriate environment variables for the client programs,and execute SESSION-PROGRAM such as x-session-manager.
ibus-daemon is a daemon program for ibus and it is also a start up program for users to activate ibus daemon, engines and panel.
daemon is a computer program that runs as a background process, rather than being under the direct control of an interactive user.
ibus is an intelligent input bus.
bus is simply a set of wires connecting multiple modules (processor, memory, IO devices).
The exec
Then my question was why do exec env when we are already execution the command from sh .
The exec command replaces the current shell process with the specified command. Normally, when you run a command a new process is spawned (forked), the exec command does not spawn a new process. Instead, the current process is overlaid with the new command. In other words the exec command is executed in place of the current shell without creating a new process.
Use of env — If you want to modify the environment for a program before executing the main program, you’d often write an script and at the end of it start the main program. But there is no need for the script to stay in memory at that time. So, exec is used in these cases so that, the main program can replace the mother script.
- What are possible use of exec command?
- https://stackoverflow.com/questions/18351198/what-are-the-uses-of-the-exec-command-in-shell-scripts
- https://unix.stackexchange.com/questions/265405/meaning-of-exec-env-command
Understanding im-launch in Ubuntu Startup: Purpose and Effects of Disabling
In this article, we will delve into the im-launch startup entry in Ubuntu, its purpose, and the potential effects of disabling it. This article is intended for system administrators and users with a basic understanding of Ubuntu and its startup process.
Quick Answer
Disabling the im-launch startup entry in Ubuntu can potentially affect the input methods on your system, particularly if you use non-Latin keyboard layouts or require complex character input. It is important to understand the purpose and effects of im-launch before making any changes to your system’s configuration.
Table of Contents
- What is im-launch?
- Breaking Down the im-launch Startup Entry
- Effects of Disabling im-launch
- Conclusion
What is im-launch?
The im-launch command in Ubuntu is part of the im-config package, which is used to manage input methods on your system. It is a script that launches the input method daemon and sets up the necessary environment variables. The im-launch startup entry is responsible for checking the display server type and the existence of the /usr/bin/ibus-daemon file. It determines whether to execute the im-launch command with specific environment variables.
Breaking Down the im-launch Startup Entry
- sh -c : This command is used to execute the following command in a subshell.
- if ! [ -e «/usr/bin/ibus-daemon» ] && [ «x$XDG_SESSION_TYPE» = «xwayland» ] : This if statement checks two conditions:
- ! [ -e «/usr/bin/ibus-daemon» ] checks if the /usr/bin/ibus-daemon file does not exist.
- [ «x$XDG_SESSION_TYPE» = «xwayland» ] checks if the value of the $XDG_SESSION_TYPE environment variable is equal to “wayland”.
This startup entry is used to ensure that the correct input method is used based on the type of display server and the existence of the ibus-daemon file.
Effects of Disabling im-launch
Disabling the im-launch startup entry would prevent the im-launch command from being executed during startup. The specific consequences of disabling it would depend on the purpose and functionality of the im-launch command in your system.
In general, disabling im-launch could potentially affect the input methods on your system, particularly if you are using a non-Latin keyboard layout or require complex character input. It could also impact applications that rely on specific input methods.
Before disabling im-launch , it’s important to understand its role in your system and consider any potential impact on your system’s functionality.
Conclusion
The im-launch startup entry in Ubuntu plays a crucial role in setting up the correct input method based on your system’s configuration. Disabling it could potentially affect your system’s input methods and overall functionality. Therefore, it’s crucial to understand its purpose and effects before making any changes.
Remember, it’s always a good practice to backup your system or create a restore point before making significant changes to your system’s configuration. If you’re unsure about the effects of disabling im-launch , consider seeking advice from a knowledgeable source or the Ubuntu community.
What is the purpose of the `im-launch` startup entry in Ubuntu?
The im-launch startup entry is responsible for setting up the correct input method based on the system’s configuration. It checks the display server type and the existence of the ibus-daemon file to determine the appropriate input method to use.
What is the `im-launch` command?
The im-launch command is a script in Ubuntu that launches the input method daemon and sets up the necessary environment variables. It is part of the im-config package, which is used to manage input methods on the system.
What happens if I disable the `im-launch` startup entry?
Disabling the im-launch startup entry would prevent the im-launch command from being executed during startup. This could potentially affect the input methods on your system, particularly if you use a non-Latin keyboard layout or require complex character input. It may also impact applications that rely on specific input methods.
How can I disable the `im-launch` startup entry?
To disable the im-launch startup entry, you can remove or comment out the corresponding line in the appropriate startup script. The specific location of the startup script may vary depending on your Ubuntu version and desktop environment.
Are there any alternatives to disabling `im-launch`?
Instead of disabling im-launch , you can modify its behavior by adjusting the conditions in the startup entry. For example, you can change the conditions to exclude specific display server types or modify the existence check for the ibus-daemon file. This allows you to customize the input method setup according to your needs without completely disabling it.
How can I determine if disabling `im-launch` will affect my system?
Before disabling im-launch , it’s important to understand its role in your system and consider any potential impact on your system’s functionality. You can consult the documentation of the im-config package or seek advice from the Ubuntu community or knowledgeable sources to understand the specific effects of disabling im-launch in your system.