Tar and Taper for Linux
Start taper, by typing:
You will then be presented with the main taper window. There are three main modules—backup, restore and mkinfo, as well as preference management options. Select the backup option.
If an archive exists, you will be asked whether you wish to append files to it, or whether you wish to overwrite it. As with all dialog boxes, the space-bar toggles between the options, and ENTER will select the currently highlighted option.
If the archive doesn't exist, you will be prompted for the archive title.
Next you will be prompted for the volume title.
You will then be presented with a screen with three panels. The top left shows the current directory on the hard disk, the top right shows what's currently on the archive and the bottom panel is used to show which files have been selected for backup. At the top of the screen is the archive ID and archive title.
To move between panels, press the TAB key. To get help on keys, press H.
You now need to select which files and directories you wish to backup. Use the cursor keys to move around the directory. Pressing ENTER when the highlight is on a directory will move into that directory.
When you find a file or directory you wish to back up, press S. The file/directory will then be sized and moved to the bottom window—if you selected a directory, taper will check with you that you really want to back it up. Press ENTER to confirm. To disable the confirmation, change this in global preferences (Prompt Directories).
In the bottom window, the file/directory will be printed as well as its size. Also, to the left of this, there will be an I or F. This indicates that the file/directory will be backed up in incremental mode (IM.) or full backup mode (F). To toggle between F and I modes, press S when the highlight is on the selected file or directory.
When you select directories, all directories under that directory are recursively included.
If you wish to deselect a file, move the cursor to the bottom window (using TAB) and then move the highlight to the file/directory you wish to deselect. Press D and the file/directory will be deselected.
If you select a file (e.g., /usr/home/john/xyz) and then select the directory in which the file resides (e.g., /usr/home/john), taper automatically recognizes that the file has been selected twice and will put brackets around the file (/usr/home/john/xyz) to tell you so. When doing the backup, the file will be backed up only once.
When you have finished selecting, press F and taper will commence the backup. Pressing Q at any time will abort the backup.
Select restore from the taper main menu.
You will then be presented with a list of all the archives taper knows about. They are sorted in archive ID order and the archive title is also printed. The highlight will be on the archive that is currently in the tape drive. Move the highlight onto the archive that you wish to restore from and press ENTER.
You will then be presented with three panels. The top left shows the files and directories currently on the archive, the top right shows a summary of the whole archive and the bottom panel is used to show the directories and files selected for restoring.
Use the cursor keys to move the highlight to select which files you wish to restore—pressing S selects the file/directory the highlight is currently on. Directories are recursively selected.
When you have selected a file/directory, it is transferred to the bottom window. In a similar way to backup, restore will put brackets around files selected twice.
In the select window, after the filename, the volume number is printed. This will show either a volume number or M. If M appears, taper is operating in most recent restore mode and will restore only the most recent copy of that file. If a volume number is displayed, the file will be restored from that volume, regardless of how recent the file in that volume is. You can toggle between the two modes by pressing S in the select window.
To deselect a file, position the highlight on the file you wish to deselect and press D.
When you have finished selecting files for restore, press F and taper will commence the restore. Pressing Q will abort the restore operation.
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
Free to Linux Journal readers.Register Now!
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide