Debian

Console

• Bulk rename files on a linux system
• Clear the history
• Debian, ssh
• Encrypt a file using gpg
• Find out bits of linux
• debian, dig
• rename a user / change username
• Install Java

Config/Setup/Install

System

• .bashrc
• 32 bit apps on 64 bit debian
• Add non-free firmware drivers
• Debian Proxy on command line
• Debian, alternatives, change defaults for editor or browser
• Debian, entries for the sources.list, apt-get
• Debian, new installation
• Debian, start something at system start
• Firehol
• Linux history with date
• apt-get, proxy
• debian, create swapfile
• debian, minimum to send mail but not receive any
• Check disks

lsblk -f

• Error: update-initramfs warning: initramfs-tools configuration sets RESUME but no matching swap device is available
• Automatically update date/time

Use a backport

(source)

• Using a backport

upgrade Debian to the next major version

• upgrading Debian to the next major version

date uses wrong timezone, shows wrong format

timedatectl list-timezones | grep Berlin
timedatectl set-timezone Europe/Berlin

man date
vi ~/.bashrc
alias date="date +'%F %T'"

Other

• Debian, E-Mail server
• Apache 2
• Installing MediaWiki on Debian

• Debian, Citrix client
• Debian, create self signed SSL certificate
• Icedove, attachment list empty, can't open attachment
• Install mumble server
• Install ncurses for php on Debian
• Jabber server jabberd14
• Oracle developer, Type the full pathname of a J2SE installation
• PHP 5.3 with stable debian
• Upgrade Debian Jessie with MediaWiki to Stretch
• debian, apt-get for qmake/make

sudo

apt-get install sudo
adduser <user> sudo
adduser andreas sudo

User andreas has to relogin for the new group to be enabled for him. To check if you are part of the group sudo use

groups

Modify sudo rights and behavior:

visudo

Set vi as editor for visudo (.bashrc of root, will not work this way for any sudo user without more work)

 export SUDO_EDITOR=`which vi`

Using sudo without password:

%sudo ALL=(ALL) NOPASSWD: ALL

Make sure to add this as last line or at least after all lines which do anything like this because otherwise the other rules will be used instead of this one.

Don't put your stuff into the regular sudo file which is shown by visudo. Instead create a file

vi /etc/sudoers.d/custom

and add content like this:

# activate this to allow all commands without password
# %sudo ALL=(ALL) NOPASSWD: ALL

# command per user which don't need a password, comma seperated
andreas ALL=(ALL) NOPASSWD: /usr/sbin/shutdown, /usr/bin/ls

top

The output of top looks uninteresting and is bad to read. This does not have to be that way. Download Media:Top-config.zip to your home directory, unzip it and hope it does not crash/destroy something in your system. I only tested this with Debian 10.

• download to your home directory
• unzip
• call top

top

I just pressed '?' and tried the things they tell you there. Then I zipped the result.

install c++

sudo apt-get install build-essential manpages-dev libstdc++-8-doc

If libstdc++-8-doc does not exist, check for later versions. libstdc++-9-doc ...

Repository changes

This must be accepted explicitly before updates for this repository can be applied. See apt-secure

apt-get update --allow-releaseinfo-change

screen "press space or return to end"

.screenrc

startup_message off