viewing bash output from another shell retrospectively












3















I have python process running from a shell on a Linux. At the moment I don't have physical access to this machine and only can connect through ssh.

I know that the python process stopped and I suspect there is an error trace in this shell.

I can get pid of the shell but I can't find a way to display what is in this shell. Basically, I am looking to find a way to read what is already there and do not lose this output or close the shell.
What would be the Linux tool to have a second view of what is going on in already running shell?










share|improve this question























  • Has the shell been run through a terminal (ie did you launch it from a GUI)?

    – davidgo
    9 hours ago











  • You could install a VNC server and then connect to it, to view the terminal shell? If you used a tty then I'm not sure how to view it remotely.

    – QuickishFM
    9 hours ago











  • @davidgo the shell was started when on gnome and it is tty. I can't install VNC on this machine

    – tomasz74
    9 hours ago











  • I would recommend going forward to use: linux.die.net/man/1/screen

    – kylie.a
    2 hours ago
















3















I have python process running from a shell on a Linux. At the moment I don't have physical access to this machine and only can connect through ssh.

I know that the python process stopped and I suspect there is an error trace in this shell.

I can get pid of the shell but I can't find a way to display what is in this shell. Basically, I am looking to find a way to read what is already there and do not lose this output or close the shell.
What would be the Linux tool to have a second view of what is going on in already running shell?










share|improve this question























  • Has the shell been run through a terminal (ie did you launch it from a GUI)?

    – davidgo
    9 hours ago











  • You could install a VNC server and then connect to it, to view the terminal shell? If you used a tty then I'm not sure how to view it remotely.

    – QuickishFM
    9 hours ago











  • @davidgo the shell was started when on gnome and it is tty. I can't install VNC on this machine

    – tomasz74
    9 hours ago











  • I would recommend going forward to use: linux.die.net/man/1/screen

    – kylie.a
    2 hours ago














3












3








3


2






I have python process running from a shell on a Linux. At the moment I don't have physical access to this machine and only can connect through ssh.

I know that the python process stopped and I suspect there is an error trace in this shell.

I can get pid of the shell but I can't find a way to display what is in this shell. Basically, I am looking to find a way to read what is already there and do not lose this output or close the shell.
What would be the Linux tool to have a second view of what is going on in already running shell?










share|improve this question














I have python process running from a shell on a Linux. At the moment I don't have physical access to this machine and only can connect through ssh.

I know that the python process stopped and I suspect there is an error trace in this shell.

I can get pid of the shell but I can't find a way to display what is in this shell. Basically, I am looking to find a way to read what is already there and do not lose this output or close the shell.
What would be the Linux tool to have a second view of what is going on in already running shell?







linux bash shell






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 9 hours ago









tomasz74tomasz74

132147




132147













  • Has the shell been run through a terminal (ie did you launch it from a GUI)?

    – davidgo
    9 hours ago











  • You could install a VNC server and then connect to it, to view the terminal shell? If you used a tty then I'm not sure how to view it remotely.

    – QuickishFM
    9 hours ago











  • @davidgo the shell was started when on gnome and it is tty. I can't install VNC on this machine

    – tomasz74
    9 hours ago











  • I would recommend going forward to use: linux.die.net/man/1/screen

    – kylie.a
    2 hours ago



















  • Has the shell been run through a terminal (ie did you launch it from a GUI)?

    – davidgo
    9 hours ago











  • You could install a VNC server and then connect to it, to view the terminal shell? If you used a tty then I'm not sure how to view it remotely.

    – QuickishFM
    9 hours ago











  • @davidgo the shell was started when on gnome and it is tty. I can't install VNC on this machine

    – tomasz74
    9 hours ago











  • I would recommend going forward to use: linux.die.net/man/1/screen

    – kylie.a
    2 hours ago

















Has the shell been run through a terminal (ie did you launch it from a GUI)?

– davidgo
9 hours ago





Has the shell been run through a terminal (ie did you launch it from a GUI)?

– davidgo
9 hours ago













You could install a VNC server and then connect to it, to view the terminal shell? If you used a tty then I'm not sure how to view it remotely.

– QuickishFM
9 hours ago





You could install a VNC server and then connect to it, to view the terminal shell? If you used a tty then I'm not sure how to view it remotely.

– QuickishFM
9 hours ago













@davidgo the shell was started when on gnome and it is tty. I can't install VNC on this machine

– tomasz74
9 hours ago





@davidgo the shell was started when on gnome and it is tty. I can't install VNC on this machine

– tomasz74
9 hours ago













I would recommend going forward to use: linux.die.net/man/1/screen

– kylie.a
2 hours ago





I would recommend going forward to use: linux.die.net/man/1/screen

– kylie.a
2 hours ago










3 Answers
3






active

oldest

votes


















5














There's this answer on ServerFault:




setterm can dump the contents of a Linux virtual console:



setterm -file log.txt -dump [ttynumbers]


However, it does not have access to the scrollback buffer, only to what's currently displayed.




This will work if you want to peek into /dev/tty?, not /dev/pts/*, I think. Use ps -e to identify the tty number of the shell in question. During my tests I have successfully dumped /dev/tty2 with the following command:



sudo setterm -file log.txt -dump 2





share|improve this answer

































    1














    While you cannot view what's already happened (unless you can get that session back) there's an excellent tool called tmux which helps with this.



    Simply install (sudo apt install tmux), run it (tmux) and then run the process you want inside the tmux terminal. Then hit Ctrl+B, then D, to detach it - this will get you back to your previous shell and you can close the terminal. Then, connect to it from SSH or open another terminal (whatever you fancy) and run tmux attach. That will get you back to your terminal. There are other options to explore, but this is a basic form of using tmux across different terminal sessions.






    share|improve this answer



















    • 2





      This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)

      – davidgo
      7 hours ago



















    0














    The traditional tool for recording a terminal session is script. It is widely available, usually by default, on most Unix and Unix-like systems.






    share|improve this answer























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      3 Answers
      3






      active

      oldest

      votes








      3 Answers
      3






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      5














      There's this answer on ServerFault:




      setterm can dump the contents of a Linux virtual console:



      setterm -file log.txt -dump [ttynumbers]


      However, it does not have access to the scrollback buffer, only to what's currently displayed.




      This will work if you want to peek into /dev/tty?, not /dev/pts/*, I think. Use ps -e to identify the tty number of the shell in question. During my tests I have successfully dumped /dev/tty2 with the following command:



      sudo setterm -file log.txt -dump 2





      share|improve this answer






























        5














        There's this answer on ServerFault:




        setterm can dump the contents of a Linux virtual console:



        setterm -file log.txt -dump [ttynumbers]


        However, it does not have access to the scrollback buffer, only to what's currently displayed.




        This will work if you want to peek into /dev/tty?, not /dev/pts/*, I think. Use ps -e to identify the tty number of the shell in question. During my tests I have successfully dumped /dev/tty2 with the following command:



        sudo setterm -file log.txt -dump 2





        share|improve this answer




























          5












          5








          5







          There's this answer on ServerFault:




          setterm can dump the contents of a Linux virtual console:



          setterm -file log.txt -dump [ttynumbers]


          However, it does not have access to the scrollback buffer, only to what's currently displayed.




          This will work if you want to peek into /dev/tty?, not /dev/pts/*, I think. Use ps -e to identify the tty number of the shell in question. During my tests I have successfully dumped /dev/tty2 with the following command:



          sudo setterm -file log.txt -dump 2





          share|improve this answer















          There's this answer on ServerFault:




          setterm can dump the contents of a Linux virtual console:



          setterm -file log.txt -dump [ttynumbers]


          However, it does not have access to the scrollback buffer, only to what's currently displayed.




          This will work if you want to peek into /dev/tty?, not /dev/pts/*, I think. Use ps -e to identify the tty number of the shell in question. During my tests I have successfully dumped /dev/tty2 with the following command:



          sudo setterm -file log.txt -dump 2






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 8 hours ago

























          answered 9 hours ago









          Kamil MaciorowskiKamil Maciorowski

          26k155679




          26k155679

























              1














              While you cannot view what's already happened (unless you can get that session back) there's an excellent tool called tmux which helps with this.



              Simply install (sudo apt install tmux), run it (tmux) and then run the process you want inside the tmux terminal. Then hit Ctrl+B, then D, to detach it - this will get you back to your previous shell and you can close the terminal. Then, connect to it from SSH or open another terminal (whatever you fancy) and run tmux attach. That will get you back to your terminal. There are other options to explore, but this is a basic form of using tmux across different terminal sessions.






              share|improve this answer



















              • 2





                This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)

                – davidgo
                7 hours ago
















              1














              While you cannot view what's already happened (unless you can get that session back) there's an excellent tool called tmux which helps with this.



              Simply install (sudo apt install tmux), run it (tmux) and then run the process you want inside the tmux terminal. Then hit Ctrl+B, then D, to detach it - this will get you back to your previous shell and you can close the terminal. Then, connect to it from SSH or open another terminal (whatever you fancy) and run tmux attach. That will get you back to your terminal. There are other options to explore, but this is a basic form of using tmux across different terminal sessions.






              share|improve this answer



















              • 2





                This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)

                – davidgo
                7 hours ago














              1












              1








              1







              While you cannot view what's already happened (unless you can get that session back) there's an excellent tool called tmux which helps with this.



              Simply install (sudo apt install tmux), run it (tmux) and then run the process you want inside the tmux terminal. Then hit Ctrl+B, then D, to detach it - this will get you back to your previous shell and you can close the terminal. Then, connect to it from SSH or open another terminal (whatever you fancy) and run tmux attach. That will get you back to your terminal. There are other options to explore, but this is a basic form of using tmux across different terminal sessions.






              share|improve this answer













              While you cannot view what's already happened (unless you can get that session back) there's an excellent tool called tmux which helps with this.



              Simply install (sudo apt install tmux), run it (tmux) and then run the process you want inside the tmux terminal. Then hit Ctrl+B, then D, to detach it - this will get you back to your previous shell and you can close the terminal. Then, connect to it from SSH or open another terminal (whatever you fancy) and run tmux attach. That will get you back to your terminal. There are other options to explore, but this is a basic form of using tmux across different terminal sessions.







              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered 9 hours ago









              QuickishFMQuickishFM

              765




              765








              • 2





                This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)

                – davidgo
                7 hours ago














              • 2





                This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)

                – davidgo
                7 hours ago








              2




              2





              This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)

              – davidgo
              7 hours ago





              This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)

              – davidgo
              7 hours ago











              0














              The traditional tool for recording a terminal session is script. It is widely available, usually by default, on most Unix and Unix-like systems.






              share|improve this answer




























                0














                The traditional tool for recording a terminal session is script. It is widely available, usually by default, on most Unix and Unix-like systems.






                share|improve this answer


























                  0












                  0








                  0







                  The traditional tool for recording a terminal session is script. It is widely available, usually by default, on most Unix and Unix-like systems.






                  share|improve this answer













                  The traditional tool for recording a terminal session is script. It is widely available, usually by default, on most Unix and Unix-like systems.







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 3 hours ago









                  Greg A. WoodsGreg A. Woods

                  191210




                  191210






























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