Create a bcrypt hash on commandline

Its easy to create a bcrypt hash  on commandline with this command:

Just replace the Placeholder USER and PASSWORD with the corresponding values. The Result should be something like that:

The part before “:” is the username. The rest is the bcrypt password hash. The -C parameter specifies the computing time for the […]

Base64 encode on shell

Sometimes you need to encode a string  with a base64 encoding. For example when trying to send a HTTP request with a Basic Authentication header like that:

As you can see the Basic Auth username and password are included in the request as a base64 encoded string. On the Linux shell this string can […]

Wipe a disk via Linux shell

This is how to wipe a disk via Linux shell:

The command above erases all data on the device /dev/sdc and overrides the data 2 times. Finally every bit is overridden by zeros. So in sum it takes 3 iterations to wipe a disk via Linux shell. n specifies the number of iterations taken place […]

Setup monit behind Apache proxy under ISPConfig

Today I wanted to setup monit behind Apache proxy on my webserver, which runs ISPConfig (https://www.ispconfig.org/) under Debian. Monit is a OpenSource monitoring tool for Linux (see https://mmonit.com/monit/). Requirements I had the following requirements on the solution: monit should only be accessible from the server itself (localhost) monit should run under a special SSL-secured URL (not IP:PORT as […]

Count search results on Linux shell

Lets imagine you want to search for a term in a file and you want to know, how often it can be found in the file. With this command combination you can count search results on bash:

This is how this way to count search results works: The input file is opened in less. Afterwards […]

Convert linefeeds for all files in a folder (CRLF to LF)

If you are working in teams using different operating systems, it could happen, that you get files with unsuitable linefeeds in it. For me as a Linux user the bad guys are normally CRLF’s (Carriage Return and Line Feed @see https://en.wikipedia.org/wiki/Newline). To just convert the CRLF’s in a single file to LF you can use the […]

Simple rsync based backup script

This simple bash script is able to backup all given files and folders to a backup destination. I use it to backup all my Raspberry Pis, Banana Pis and also my notebook to my Synology NAS.

Example call:

If you want to run it as a crontab, you can use key based authentication (see […]