Resolution of the error Notice: Trying to get property of non-object in block_block_view() in a Drupal 7 based website.
Resolution of an error in the Dovecot configuration file regarding the unknown protocol sieve is explained.
PHP was not executing inside an HTML file. Step by step procedure for executing PHP in HTML using the nginx web server.
A website was not opening in the browser as its SSL certificate had expired. Steps required to resolve the problem are given.
Some programs do not write the Exif metadata on the output file. Using exiftool command, the metadata can be transferred to the output file.
IPTC metadata can be added to an image using the exiv2 command in Linux. How to add IPTC metadata in image files is explained.
Quite often, the value of Pi is required in calculations. The steps for calculating the value of Pi and using it in bc is explained.
While running the dig command, "sendmsg failed: operation not permitted" error were observed. Steps taken for resolution of errors are given.
A Perl script for generating the report of the most frequent visitors to a website from the nginx log file is given.
The download of an Android app with the adb gave the error INSTALL_PARSE_FAILED_NO_CERTIFICATES. Steps for resolving the error are given.