Linux: Rescan for new and changes of devices

Hi,

with virtualization it simply possible to change systems within a few mouse clicks. For example adding new disks or increasing the disk size of a hard disk without a reboot.
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Linux: Connection timed out, cannot reboot systemd based system

Hi,

sometimes it occours that a systemd based Linux cannot rebooted.
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Mail: Connect TLS encrypted to a smtp server by telnet

Hi,

the SMTP protocol is ASCII based. In the past, the SMTP protocol goes unencrypted over the wire means you can simply send email by connecting to the SMTP port 25 and enter some SMTP commands via telnet:

michael@debdev ~ # telnet smtp.yourdomain.org 25
EHLO test.example.com
MAIL FROM:info@yourdomain.org
RCPT TO:receiver@receiversdomain.org
DATA
Subject: Testmessage
<ENTER>
<ENTER>
This is a test message. End with <ENTER><ENTER> and point

.
QUIT

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Debian: Shutdown when pressing power button

Hi,

when you install Debian with just the Standard minium System utilities a power off by pressing the power button is not possible.

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Linux: HEX edit and diff in a shell

Hi,

let us assume you want to edit a binary file /tmp/binfile and you want to replace all strings matches to “sda” by “hda”.

gnu sed can edit bin files by the \xnn hex notation. The option –in-place changes the original file and makes a backup copy with a file extension .org

michael@devdeb ~#  sed -e 's/\x73\x64\x61/\x68\x64\x61/g' /tmp/binfile --in-place=.org

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