How to trigger a system self destruct with a certain password is entered
How do I configure my system to destroy all personal data when a certain password is entered? The motivation behind this being NSA stuff.
Unix & Linux
Shell, Concatenating 2 strings to reference a 3rd variable
I am trying to do the following in my script:
Mod, Meta, Super … keys?
In Window Managers circle there are some technical terms; couple of them are Mod keys and Meta keys. The questions here I am asking are
systemd start as unprivileged user in a group
I’d like users in group foogroup to be able to:
WM_CLASS vs WM_INSTANCE?
When I run xprop I get a class string that has two values, one of them i3 calls an instance, the other a class, for example on chromium-browser the xprop utility will return something like this,
How to check if there are no parameters provided to a command?
How do you check if $* is empty? In other words, how to check if there were no arguments provided to a command?
Problem in identifying key that causes random character in terminal
I have kali linux on my laptop.I have a problem with my keyboard . Whenever i open a terminal some key is pressed automatically and ^[[5~ this character is shown in terminal. Please tell me which key causes this issue. 
Using sftp to Transfer a Directory?
When I try to use sftp to transfer a directory containing files, I get an error message:
ssh unable to negotiate – no matching key exchange method found
I am trying to log in to my DSL router, because I’m having trouble with command-line mail. I’m hoping to be able to reconfigure the router.
iptables redirect outside requests to 127.0.0.1
I have a service running on 127.0.0.1 with port 2222. I need to forward all requests to 192.168.2.2:2222 (outside IP) only from subnet 192.168.1.0/24 to 127.0.0.1:2222.