![]() One solution that I have alluded to is to call your script with Rscript. I sometimes have long running R sessions for model training. (Or: how to make the command line work for you, especially when the network is conspiring to stop you.I wanted to write a quick post about a useful linux tool for using R. Hopefully, you'll find GNU Screen as useful as I do, and take advantage of this frequently overlooked utility.įor more on GNU Screen, read the man page or check out this quick reference.īob Murphy will be giving a talk at SCALE 15x this year entitled: A brief introduction to GNU screen. If there was a deficiency that needed to be addressed, I'd quickly look for a better tool, but Screen does the job I need it to. It was already installed on the servers that I work on, and does the jobs I need perfectly. I am frequently asked why to use Screen instead of something newer like tmux? My answer is simple: GNU Screen is easy to use, and ubiquitous. A screen session can be locked with the Ctrl+a x command which will lock the screen with the current user's password. A screenshot of what is currently in your screen window can be invoked with Ctrl+a h, creating a file called hardcopy.X. X where X is the number of your screen session. Log files of current screen sessions can be started with the Ctrl+a H command, which will make a file called screenlog. In more recent versions of screen, a vertical split can be created with Ctrl+a |. A split window can be eliminated with Ctrl+a X. The other window switching commands work within a split screen. Switching between the regions is done with Ctrl+a Tab. This will split your current window in half horizontally. A horizontal split is done with Ctrl+a S. I was able to install screen using ports on FreeBSD as well. Under Debian and derivatives like Ubuntu, you can do the same with apt-get. For example, on Red Hat Enterprise Linux or Fedora, I was able to use yum or dnf, respectively, to install. On all of the Linux distributions that I tried it on, I was able to use the standard package manager to install screen from the default repositories. Screen is installed by default on some distributions, such as SuSE and Slackware. This can be a lifesaver if your network connection is unreliable. If the host has not acknowledged that your session has disconnected, you can use screen -r -d for resume and disconnect to allow screen to disconnect the session, and reconnect. If your session were to disconnect abruptly, you can similarly reconnect with the same command. Your screen session will resume from where you left off, with all processes running as you left them. When you want to continue, log in again and start screen with the -r (for resume) option. You can then log out of your SSH session. Ctrl+a d disconnects your screen session. This can be most useful when you are on an unreliable connection, or if you know you'll be moving from one network to another, or one computer to another. One of the most powerful features of Screen is the ability to disconnect and reconnect your screen sessions. There is also a command that displays a list of all the current windows, and allows for selection with the cursor keys, Ctrl+a ". Alternately, Ctrl+a # switches between screen sessions by number, in the order that they were started in. Ctrl+a K will kill the current window.Ĭtrl+a n and Ctrl+a p will move to the next and previous screens respectively. This acts like an independent window with its own shell. Typing Ctrl+a c starts a new window within Screen. Screen allows you to create multiple windows within your single terminal session. For example Ctrl+a ? brings up the help page with the default key bindings. Ctrl+a followed by a character is how you send command sequences to screen. ![]() All characters typed in a screen session are sent directly to the shell, with the exception of Ctrl+a. ![]() Screen works with a control sequence, Ctrl+a. Screen basicsįirst, a little bit about how to control Screen. Screen is started simply with the screen command. Free online course: RHEL Technical Overview.
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