Linux

A practical TLS checklist for Linux mail servers: separate public SMTP from authenticated submission, configure Postfix and Dovecot, renew certs, and align DNS.

sudo mount -t cifs -o username=[USERNAME],password=[PASSWORD],vers=1.0 //192.168.1.1/samba [MOUNT-FOLDER]

Router: ZTE F600W with USB mount and Samba service enabled.

A practical guide to WordPress backup solutions: what to back up, how often, where to store copies, and how to test restores before trouble hits.

Statistics R-project

https://www.rstudio.com/

Apache

https://spark.apache.org/

https://kafka.apache.org/

https://hadoop.apache.org/

Free alternative to Adobe Lightroom: http://www.darktable.org/

A practical checklist for fixing mailR and rJava errors on Ubuntu, including libjvm.so, javareconf, Java paths, and production checks.

Took me a while to find the perfect command for finding the biggest directory in the linux terminal. I was looking for something similar to the graphical tools like QDirStat and K4DirStat (Directory Statistics). In windows you can achieve this with windirstat.

Use find:

Nice thing to use when working with CSV-files is CSV Kit.

See the file statistics: csvstat -e UTF-16 test.csv

Merge all files in a folder: csvstack -e UTF-16 -t *.csv > all.csv

Save column 2 to output .csv: csvcut -c 2 -e UTF-8 all.csv > output.csv

pip show csvkit

Here is a useful command when you need to shutdown you machine at a specific time of the day. For example after a specific event you needed to log.

shutdown -h hh:mm

Shutdown scheduled for ons 2017-04-12 22:35:00 ICT, use 'shutdown -c' to cancel.

Remark, you can can always cancel the shutdown with "shutdown -c".

Example:

shutdown -h 22:35

Get more info with "shutdown --help".