fail2ban-client

An example of the fail2ban-client command would be:

fail2ban-client status filter-name 

where filter name is the name of a file in /etc/fail2ban/filter.d/

Netbeans build.xml file

 Below is a couple of additions I've made in the past to the build.xml files:

Creating a jar file, adding to, extracting and viewing the contents of...

To view the contents of a jar file:

jar tf jar-file.jar

To run a jar file:

java -jar jar-file.jar

Remote Monitor

Remote Monitor v:1.9

Proton-5 v:1.2

Force zerotier one to stop and preventing reload on Mac

To unload the service and stop: 

launchctl unload -w /Library/LaunchDaemons/com.mysql.mysql.plist

To load the service and start:

launchctl load -w /Library/LaunchDaemons/com.mysql.mysql.plist

[source]

Reset mySQL (mariadb) master/slave with GTID replication

To reset and start fresh, do;

Issue with slackpkg and gpg key

I found an issue while using slackpkg where the following error presented itself:

ERROR: Verification of the  gpg signature on CHECKSUMS.md5
               failed! This could mean that the file is out of date
               or has been tampered with. If you use mirrors.slackware.com
               as your mirror, this could also mean that the mirror to
               which you got redirected is not yet updated with the most
               recent changes in the Slackware tree.

An alternative way to use wget

Normally wget works as expected but every now and then, you page is forbidden or similar, so the below is an alternative approach;

Import certificate into Java keystore

The below example involves importing a Zscaler root CA certificate into the java keystore on my Slackware installation.

sudo keytool -import -trustcacerts -alias zscaler -file /etc/ssl/certs/Zscaler-Dalzell.crt -keystore /opt/jdk1.8.0_341/jre/lib/security/cacerts

Note: The destination, in this case '/opt/jdk1.8.0_341/jre/lib/security/cacerts' could quite equally point to a local installation, such as '/home/some_user//some_application/jre/lib/security/cacerts'

 

Linux boot and shutdown times

 

To find the last boot time, can of course do w which will show us how long the system has been up, but to save the mental arithmetic, we can do:

who -b or uptime -s

To find the last shutdown time, we can do:

last -x | grep shutdown or last -x | grep reboot (output varies between distributions)