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Screen: A SysAdmin's PowerTool

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Software

A major power tool that I left out of my sysadmin's toolbox article is GNU Screen. Screen has been an absolute lifesaver in the past, especially because I sometimes work remotely over wifi connections that might not always be the most reliable. Screen is a session manager for shells, a way to run and preserve multiple shells without actually having to be connected to the server. The most common way I use screen is over ssh. When connected to a server over ssh, the bash session is run over that connection, so any programs or scripts that are run are also dependent on the ssh session being active. However, when screen is run, it runs in the background, separate from the ssh session. That means screen lets your wifi connection die in the middle of running a script without the script dying as well.

Consider this scenario:




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