Tools

Sometimes it’s necessary to quick show differences between two outputs of two Linux commands. You can dump stdout into separated files of course and process them later but fortunately there is a simpler solution.

Imagine that you want compare output of two executions of ‘ps’ command – first execution now and the second after 10 seconds. You can use ‘diff’ command to show differences side-by-side (-y option).

$ diff -y file1 file2

Now let’s replace file1 and file2 by input streams (< char) from ‘ps’ command. Continue Reading

Some days ago I experienced weird problem with my Enigmail in Icedove e-mail client. When I tried send signed or encrypted message I saw the following error message:

“GnuPG reported an error in the communication with gpg-agent (a component of GnuPG).”

Problem is caused by compatibility issues betwwen GnuPG and Enigmail plugin.

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Rsync is a very powerful  backup tool. It can significantly speed up backup process and minimize amount of data transferred during synchronization. In most cases rsync is used to make incremental backups, but it also has another interesting option which gives you ability to keeping old versions of files on backup server. Mentioned option is ‘–backup’ or simply ‘-b’. Continue Reading