B4J Question jShell under Linux (Cannot run program, error=2, No such file or directory)

peacemaker · Oct 12, 2022

Hi, All

Who uses jShell under Ubunta ?
What is correct way to start commands ?

If to prepare commands - they work in the terminal, but when try to run by jShell - always error

org.apache.commons.exec.ExecuteException: Execution failed (Exit value: -559038737. Caused by java.io.IOException: Cannot run program "echo PASSWORD | sudo -S reboot" (in directory "/home/vlad/tempjars"): error=2, No such file or directory)

org.apache.commons.exec.ExecuteException: Execution failed (Exit value: -559038737. Caused by java.io.IOException: Cannot run program "/usr/bin/ls /" (in directory "/usr/bin"): error=2, No such file or directory)

What file, what directory ? Work directory is existing for sure (it's File.DirApp).
And it's about any other command in a single string.

Trying to start so:

B4X:

Sub Run_Command(cli As String)
    sh.InitializeDoNotHandleQuotes("cli", cli, Null)
    sh.WorkingDirectory = File.DirApp
    sh.RunWithOutputEvents(-1)
    Wait for cli_ProcessCompleted (Success As Boolean, ExitCode As Int, StdOut As String, StdErr As String)
       
    #if Debug
    Log(Success & "; ExitCode = " & ExitCode)
    Log("StdOut = " &  StdOut)
    Log("StdErr = " &  StdErr)
    #end if
    If Success And ExitCode = 0 Then    'all is OK
        RunLastError = ""
    Else
        RunLastError = StdErr
    End If
End Sub

How ?

teddybear · Oct 13, 2022

if echo PASSWORD | sudo -S reboot it works in cmdline. then

Create a shell script reboot.sh
like this:

B4X:

#!/bin/sh
echo PASSWORD | sudo -S reboot

put it to a path you specify such as /home/your/bin/reboot.sh
never forget to do chmod +x reboot.sh
pass it as paramenter to run_command("/home/your/bin/reboot.sh")

end if

MichalK73 · Oct 13, 2022

Are you testing in remote debug mode?
Because I see that the folder 'tempjars' appears. This folder is created and the program is compiled in debug mode. So there you have to put all the files needed for your program.

peacemaker · Oct 13, 2022

MichalK73 said:
testing in remote debug mode?

Both variants. But it's comfortable to develop under Win10, running via b4j-bridge on the target Ubunta.
What more files ? All needed is in .jar, all works, but ... just impossible to run commands that is is a single string.
This app is starting ffmpeg OK under Linux, but with many arguments: https://www.b4x.com/android/forum/t...onsole-b4j-app-under-linux.142409/post-902554

MichalK73 · Oct 13, 2022

Do you have this folder?

MichalK73 · Oct 13, 2022

Maybe you need to break it into 2 separate commands "echo PASSWORD | sudo -S reboot". Maybe jShell is unable to do this.

peacemaker · Oct 13, 2022

MichalK73 said:
Maybe jShell is unable to do this

Topic was created indeed to find how to do.
But "ls /" command is also "build-in" like "ffmpeg" (that works) is installed, but does not run:

Cannot run program "/usr/bin/ls /" (in directory "/usr/bin"): error=2, No such file or directory)

MichalK73 · Oct 13, 2022

Just give ls and not /usr/bin/ls, the system will find itself.

peacemaker · Oct 13, 2022

Did before.

MichalK73 · Oct 13, 2022

peacemaker said:
Did before.

What do you mean before?

peacemaker · Oct 13, 2022

Before creating this topic. Did you personally try jShell under Linux ?

MichalK73 · Oct 13, 2022

Of course I am using jShell in linux with ease. It works in my projects and I had no problem.

peacemaker · Oct 13, 2022

Great ! Any practically working code example ? Trying in Ubuntu 20.04 (or other Ubuntu) ? Or only some other Linux ?

MichalK73 · Oct 13, 2022

I am using CentOS and other RH based systems but this has no effect on booting.
Maybe I will post later, now I do not have access to sources.

MichalK73 · Oct 13, 2022

I used to post on a forum.
You can see.
https://www.b4x.com/android/forum/t...eb-page-using-b4j-python-with-sources.117355/

Knoppi · Oct 16, 2022

It works like this for me.
(Ubuntu is like Debian)

B4X:

'Non-UI application (console / server application)
Sub Process_Globals
    Private sh As Shell
    Private RunLastError As String
End Sub

Sub AppStart (Args() As String)
    Log("Hello world!!!")
    Run_Command( "cat", Array As String( "/etc/os-release"))
    StartMessageLoop
End Sub

Sub Run_Command( cli As String, args As List)
    Log( "Run_Command")
    
    sh.InitializeDoNotHandleQuotes( "cli", cli, args)
    sh.WorkingDirectory = File.DirApp
    sh.Run(-1)    '<<< changed
    
    Wait for cli_ProcessCompleted( Success As Boolean, ExitCode As Int, StdOut As String, StdErr As String)
      
'    #if Debug
    Log(Success & "; ExitCode = " & ExitCode)
    Log("StdOut = " &  StdOut)
    Log("StdErr = " &  StdErr)
'    #end if
    If Success And ExitCode = 0 Then    'all is OK
        RunLastError = ""
    Else
        RunLastError = StdErr
    End If
End Sub

'OUTPUT:
'
'Hello world!!!
'Run_Command
'true; ExitCode = 0
'StdOut = PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"
'NAME="Debian GNU/Linux"
'VERSION_ID="11"
'VERSION="11 (bullseye)"
'VERSION_CODENAME=bullseye
'ID=debian
'HOME_URL="https://www.debian.org/"
'SUPPORT_URL="https://www.debian.org/support"
'BUG_REPORT_URL="https://bugs.debian.org/"
'
'StdErr =

peacemaker · Oct 16, 2022

So, command separately from the argument - it's working. But if to try complex command with arguments and several piped commands (with "|") by a single string - impossible for jShell ?

Knoppi · Oct 16, 2022

you can do this
create a script

getdebian:

#!/bin/bash
cat /etc/os-release | grep debian
or 
cat /etc/os-release | grep $1

don't forget to make it executable

Bash:

chmod +x getdebian

B4X:

Run_Command( "./getdebian", Null)
or
Run_Command( "./getdebian", Array As String( "debian"))

Result:

Hello world!!!
Run_Command
true; ExitCode = 0
StdOut = ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

StdErr =

B4J Question jShell under Linux (Cannot run program, error=2, No such file or directory)

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