viewing bash output from another shell retrospectively
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
asked 2 hours ago
tomasz74tomasz74
122147
add a comment |
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
asked 2 hours ago
tomasz74tomasz74
122147
Has the shell been run through a terminal (ie did you launch it from a GUI)?
– davidgo
2 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
2 hours ago
@davidgo the shell was started when on gnome and it is tty. I can't install VNC on this machine
– tomasz74
2 hours ago
add a comment |
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
asked 2 hours ago
tomasz74tomasz74
122147
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
linux bash shell
asked 2 hours ago
tomasz74tomasz74
122147
asked 2 hours ago
tomasz74tomasz74
122147
asked 2 hours ago
tomasz74tomasz74
122147
asked 2 hours ago
tomasz74tomasz74
122147
asked 2 hours ago
tomasz74tomasz74
122147
122147
Has the shell been run through a terminal (ie did you launch it from a GUI)?
– davidgo
2 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
2 hours ago
@davidgo the shell was started when on gnome and it is tty. I can't install VNC on this machine
– tomasz74
2 hours ago
add a comment |
Has the shell been run through a terminal (ie did you launch it from a GUI)?
– davidgo
2 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
2 hours ago
@davidgo the shell was started when on gnome and it is tty. I can't install VNC on this machine
– tomasz74
2 hours ago
Has the shell been run through a terminal (ie did you launch it from a GUI)?
– davidgo
2 hours ago
Has the shell been run through a terminal (ie did you launch it from a GUI)?
– davidgo
2 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
2 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
2 hours ago
@davidgo the shell was started when on gnome and it is tty. I can't install VNC on this machine
– tomasz74
2 hours ago
@davidgo the shell was started when on gnome and it is tty. I can't install VNC on this machine
– tomasz74
2 hours ago
add a comment |
2 Answers
2
active
oldest
votes
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
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
26k155679
add a comment |
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.
answered 2 hours ago
QuickishFMQuickishFM
765
This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)
– davidgo
4 mins ago
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
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
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
26k155679
add a comment |
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
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
26k155679
add a comment |
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
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
26k155679
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
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
26k155679
edited 1 hour ago
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
26k155679
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
26k155679
answered 1 hour ago
Kamil MaciorowskiKamil Maciorowski
26k155679
26k155679
add a comment |
add a comment |
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.
answered 2 hours ago
QuickishFMQuickishFM
765
This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)
– davidgo
4 mins ago
add a comment |
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.
answered 2 hours ago
QuickishFMQuickishFM
765
This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)
– davidgo
4 mins ago
add a comment |
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.
answered 2 hours ago
QuickishFMQuickishFM
765
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.
answered 2 hours ago
QuickishFMQuickishFM
765
answered 2 hours ago
QuickishFMQuickishFM
765
answered 2 hours ago
QuickishFMQuickishFM
765
answered 2 hours ago
QuickishFMQuickishFM
765
765
This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)
– davidgo
4 mins ago
add a comment |
This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)
– davidgo
4 mins ago
This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)
– davidgo
4 mins ago
This should be a comment as it does not answer the OP's question. (Also, the screen utility does something similar)
– davidgo
4 mins ago
add a comment |
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Has the shell been run through a terminal (ie did you launch it from a GUI)?
– davidgo
2 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
2 hours ago
@davidgo the shell was started when on gnome and it is tty. I can't install VNC on this machine
– tomasz74
2 hours ago