I'm pretty new to Linux / Raspberry PI.
I want to run a command from a shell script in a new shell window since commands like "cvlc music.mp3" (VLC PLAYER) would block the shell until playback has beenn finished.
Therefore it would be nice to export the playback command to another shell
Is this correct?
gnome-terminal && lxterminal don't seem to be an option for the distribution
for testing purpose I created two dumnmy shell-scripts:
[start.sh]
#!/bin/sh
lxterminal\
--title="MyScriptWindow" \
-e "bash -c ./exe.sh;bash"\
[exe.sh]
#!/bin/sh
echo "Hello World"
[output]
root#raspberrypi:/home/pi# ./start.sh
(lxterminal:1315): Gtk-WARNING **: cannot open display:
If I've understood correctly, you are doing all this only because you want the shell to be released at the execution of your cvlc.
You only need to detach it from shell standard output and run it as a background process
nohup cvlc music.mp3 &
is this enought ?
You could also run the program in background
$> ./test.sh &
Or use screen
Using these command you wont block your shell.
Related
I'm using Linux (Mint 20.3) to run a simple Minecraft server and I want to be able to start the server with a keyboard or desktop shortcut. I also want to be able to interact with the server in a terminal after it starts. I'm currently using the server software supplied by Mojang. I wrote a little program to get things started:
#!/bin/bash
cd /home/trevor/Minecraft_Server
LD_LIBRARY_PATH=. ./bedrock_server
exec $SHELL
I can get the server to run but I have no clue how to get it to open a terminal window so I can interact with the server. I'm relatively new to Linux so any input would be greatly appreciated.
you can use screen to detach and attach to run commands into the minecraft terminal.
to install screen:
apt-get install -y screen
To launch, update your script with something like:
screen -S mcs ./bedrock_server
to reattach, run the following in a terminal:
screen -r mcs
Use screen in your script to reattach to bedrock process.
Install screen:
apt-get install screen
Define your script as:
#!/bin/bash
export LD_LIBRARY_PATH=.
cd /home/trevor/Minecraft_Server
screen -d -m -S bedrock ./bedrock_server
After invoke your script, screen creates a socket that can be used to reattach to your script terminal. You can show screen sockets available with:
screen -ls
Parameter -S defined 'bedrock' as the socket name. So you can open another terminal as you like and reattach to the bedrock process with:
screen -r bedrock
If you detach the screen with CTRL+C the screen will be closed and so the minecraft bedrock server. To deattach without close the process you must use CTRL+A and CTRL+D.
I have created a startup Linux script for a board that runs Debian jessie Armbian 8.1. I need at startup to run at command in a modem attached to it via USB interface. I've put the script inside rc.local:
#!/bin/sh -e
cd /home/user/Script/
sh script.sh
exit 0
In the folder Script I have a script:
#!/bin/sh
minicom -S at_command.txt
The at_command contains:
send at+creg=1
send exit
! killall minicom
The issue is that when I run the script manually it works correctly,
however when I start the the board the at commands do not execute.
Since the board is Debian I also followed the link: ttp://www.stuffaboutcode.com/2012/06/raspberry-pi-run-program-at-start-up.html and to adapt the script to run according LSBInitScripts but I got the same behavior. When running sudo /etc/init.d/myScript start manually everything works great, but after Linux startup no at_command is executed. I added in the rc.local the following commands for debugging:
set -x;
exec 2>>/home/user/Script/minicom-rc.log;
date +"$0 %c" >&2
And in the generated log file I got this printout:
+ date +/etc/rc.local %c
/etc/rc.local Fri 02 Mar 2018 04:02:43 PM EET
+ cd /home/user/Script/
+ sh script.sh
No cursor motion capability (cm)
What I have done wrong?
I am guessing it is related to there being no terminal during startup.
Maybe try adding the following line before starting minicom:
export TERM=linux-c-nc
In this scenario you alternatively use my atinout program which is a program specifically made for sending AT commands to a modem from the command line (assuming the modem is /dev/ttyUSB0):
echo at+creg=1 | atinout - /dev/ttyUSB0 -
or possibly
atinout /home/user/at_commands.txt /dev/ttyUSB0 /dev/null
Im running python script in background on ubuntu linux with this command:
python script.py &
When Im closing terminal, its run on background
But how I can watch what script.py output, when opening terminal again?
There is many options for monitor the script in background.
First, run Screen command if you would like to disconnect the terminal. If you disconnect your terminal your script process will be an exit.
$ screen
$ python script.py &
Disconnect your terminal
$ screen -ls
Copy the PID and run the below command
$ screen -r PID
You are able to see your script output.
Several Options:
Use a tool like tmux
Use tail -f on the log file
Direct stdout to a file and use tail -f on it
python script.py > /tmp/logfile &
then later:
tail -f /tmp/logfile
Use screen to run your python script
How do you run a shell script in a new terminal in Linux from a terminal like "start test.bat" in Windows, also it should be working in the console mode.
Here's a simple example to get you started:
To write a shell script, do this on your command prompt:
echo -e '#!/bin/sh\n echo "hello world"' > abc.sh
This writes:
#!/bin/sh
echo "hello world"
To a file called abc.sh
Next, you want to set it to executable by:
chmod +x abc.sh
Now, you can run it by:
./abc.sh
And you should see:
hello world
On your terminal.
To run it in a new terminal, you can do:
gnome-terminal -x ./abc.sh
or, if it's xterm:
xterm -e ./abc.sh
Here's a list of different terminal emulators.
Alternatively, you just run it in your current terminal, but background it instead by:
./abc.sh &
I came here wanting to figure out how to make a script spawn a terminal and run it self in it, so for those who want to do that I figured out this solution:
if [ ! -t 0 ]; then # script is executed outside the terminal?
# execute the script inside a terminal window with same arguments
x-terminal-emulator -e "$0" "$#"
# and abort running the rest of it
exit 0
fi
For gnome try this.
Replace ls with the command you want to run
gnome-terminal -x sh -c "ls|less"
I hope this is what you want
As of January 2020, the -e and -x option in gnome-terminal still run properly but throw out the following warnings:
For -e:
# Option “-e” is deprecated and might be removed in a later version
of gnome-terminal.
# Use “-- ” to terminate the options and put the command line to
execute after it.
For -x:
# Option “-x” is deprecated and might be removed in a later version
of gnome-terminal.
# Use “-- ” to terminate the options and put the command line to
execute after it.
Based on that information above, I confirmed that you can run the following two commands without receiving any warning messages:
gnome-terminal -- /bin/sh -c '<your command>'
gnome-terminal -- ./<your script>.sh
I hope this helps anyone else presently having this issue :)
I am trying to run a program automatically within a bash script after killing the LXDE session. My script consists of:
#!/bin/sh
pkill lxsession;
sh /home/pi/RetroPie/EmulationStation/emulationstation
I tried this as well:
#!/bin/sh
nohup & pkill lxsession &
writevt /dev/tty1 'emulationstation'
My aim is to log out of the LXDE session and run EmulationStation on my Raspberry Pi with a bash script. I'm using pkill lxsession; to bypass lxsession's logout confirmation dialog.
As it stands, this script just gets me to the command line from a working LXDE desktop. Thanks for reading.
Dont EmulationStation need some sort of X server running in the background for it to work?
IF not, then try the following:
#!/bin/sh
pkill lxsession;
sleep 5
su -c sh /home/pi/RetroPie/EmulationStation/emulationstation
exit
It could also be that when you log out of your lxde session the emulationstation dosent have a usershell to open it, therefore "su -c"
I'm not sure if its going to work but I hope you solve it. :)