Tech Tip: Encrypt Files with GPG
Encrypting files from the command line is simple with gpg. You can use it to encrypt and decrypt files with a password.
The command gpg is part of GnuPG. GnuPG stands for GNU Privacy Guard and is GNU's tool for secure communication and data storage. It can be used to encrypt data and to create digital signatures. It also includes an advanced key management facility. GnuPG works on Linux and UNIX like operating systems as well as for Windows and Mac OS X.
To encrypt a single file, use the -c command line option with gpg. For example, to encrypt the file myfinancial.info, use the command:
$ gpg -c myfinancial.info Enter passphrase: YOUR-PASSWORD Repeat passphrase: YOUR-PASSWORD
This will create the file myfinancial.info.gpg. Note that the original file is not deleted, so once you feel safe encrypting and decrypting files, you probably want to delete your unencrypted versions of the files. Also note that depending on your system's configuration, gpg may ask for passphrases in pop-up windows rather than at the command line.
The -c option tells gpg to encrypt with a symmetric cipher. Caution: don't forget your passphrase (password), there is no way to recover data with out the passphrase.
To decrypt the file, use the command:
$ gpg myfinancial.info.gpg gpg: CAST5 encrypted data Enter passphrase: YOUR-PASSWORD
If you want to write the output to a different file, use the -o command line option:
$ gpg –o myfin.info.txt myfinancial.info.gpg
If you'd rather have a "text" file, rather than a binary file, use the -a option to gpg:
$ gpg -c -a myfinancial.info Enter passphrase: YOUR-PASSWORD Repeat passphrase: YOUR-PASSWORD
This will create the file myfinancial.info.asc rather than myfinancial.info.gpg.
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.
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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