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Howto switch to another ruby version (temporarily, per project, or globally) using rbenv
As systems engineer, who setups and maintains different servers running Ruby On Rails applications ” testing, staging, and production servers”, I’ve many ruby versions installed on my machine and I’ve to switch between them when deploying new code of ROR apps to any of my servers. Why I’ve to switchRead More
How to remove/delete CTRL-M (^M) characters from text files in Linux and UNIX systems
In this mini post, I’ll show you some methods/options to remove CTRL-M (^M) blue carriage return characters from a file in Linux and UNIX systems. Here’s you’ll find the exact answer for the following questions: How to convert plain text files in DOS/MAC format to UNIX format? Newly created SSLRead More
How to remove duplicate lines from text files on Linux/UNIX systems
One day, I was preparing a blacklist to block the porn websites on a web proxy website called “anaproxy.com”. After checking the server access logs, I could extract all the accessed urls from it’s access log, I did some operations on the urls to extract only the domain “actually IRead More
How to Logrotate Ruby On Rails Application’s Logs On Linux Systems
In this post, I’ll show you how to successfully rotate your Ruby On Rails application’s logs using Logrotate on Linux systems. Log rotation is a very important process to save your servers disk space and guarantee a healthy working environment for Linux OS. This post is valid for both RPMRead More
Howto Fix/Solve Logrotate Complains About Insecure Permissions on Parent Directory on CentOS/RHEL Linux Systems
In this post, I’ll solve an annoying error appeared when I enabled logrotate on one of my apps running on CentOS 7 Linux systems. By default on CentOS/RHEL 7, the parent permissions on your log directories play a vital role in whether or not logrotate will be able/willing to processRead More
Howto change the encoding of text files in Linux systems
How many times did you want to change the encoding of a text files in Linux systems? or How many times did you try to watch a movie and it’s subtitles .srt showed in unreadable shapes “characters” and you needed to change it to readable characters? Sure many times youRead More
Howto remove/fix “WARNING: terminal is not fully functional” in docker
How many times did you try to use top command in docker container and it didn’t work? or How many times did you try to use vim or less command and it didn’t work properly? For me many times. Both me and you saw the following error/warning messages before andRead More
Howto import a database into a Docker container
Congrats! you’re migrating your works/development environments into Docker containers. This is a new start for you as a system/devops engineer, as docker will solve many issues you faced before due to packages conflicts and package’s releases conflicts. Here’s the issue I face and made my write the mini post, AfterRead More
Howto find and detect the encoding of text files in Linux systems
How many times did you want to find and detect the encoding of a text files in Linux systems? or How many times did you try to watch a movie and it’s subtitles .srt showed in unreadable shapes “characters” ? All this because you are using a wrong encoding formatRead More
Howto remove / solve “ruby-build: definition not found or ruby version not found ” on Linux systems
In this mini post I’ll show you how to update your installed ruby version with a higher one not found by ruby-build on Linux systems (Both RPM Family “Redhat / CentOS / Scientific Linux and Debian Family “Debian / Ubuntu”). This mini post will solve this error message “ruby-build: definitionRead More
