Detecting system changes with Dnotify
FILE RESCUE
We'll show you how you can avoid the tragedy of lost files with a transparent, Perl-based version control system.
During early phases of a project, developers tend to experiment with various options, and sometimes it is too early to save prototypes in the version control system. If you haven’t set up a repository, or if you haven’t been able to agree on its structure, you might find yourself working without a safety net. In this case, good code might fall victim to an over-zealous rm * or your editor’s delete command. This month’s Perl script, noworries, can give you automatic version control. Whenever you save a file with your editor, and whenever you use the shell to manipulate files using commands like rm or mv, a daemon hidden in the background receives a message. When it does, it picks up the new or modified file, and uses RCS to version the file. All of this is transparent to the user. Figure 1 shows a user creating and then deleting a new file in the Shell. Without some Perl wizardry, the file, myfile would have been gone for good, but calling noworries -l myfile tells us that the versioner created a backup copy just 17 seconds earlier. noworries -r 1.1 myfile retrieves the file and writes its content to STDOUT.
Buy this article as PDF
(incl. VAT)
Buy Linux Magazine
US / Canada
UK / Australia
News
-
Red Hat Announces OpenShift.io
Red Hat takes its IDE online.
-
Microsoft Bakes Linux into Windows Server
Microsoft is slowly becoming a Linux vendor.
-
Fearless Coyote, Linux Kernel 4.11 is Out
The new kernel makes swap implementation more scalable, which will help cloud providers.
-
Docker Appoints Steve Singh CEO
The new CEO comes from a very strong SaaS background.
-
Docker Announces Linux Kit and Moby Project
Both projects help organizations build their own containerized systems.
-
Ubuntu Returns to Gnome as Its Mobile Plans Shatter
Mark Shuttleworth has resumed the position of CEO of Canonical.
-
Microsoft is Shutting Down CodePlex
Microsoft's open source code hosting platform CodePlex will come to an end after a more than 10-year stint.
-
Fedora 26 Alpha Released
Comes with Gnome 3.24
-
Old Linux Kernel Bug Discovered
The bug was introduced back in 2009 and has been lurking around all this time.
-
OpenSSH 7.5 Released
The new release deprecates the sshd_config UsePrivilegeSeparation option.