I took some notes of things you told me during the presentation and of some questions I promised to answer
less:
to search, type :/[search string][enter]. To find the next
match, either type :/[enter] or hit n
ctrl-z:
puts the currently running process to the background (and suspends it
there), bring back with fg
POSIX:
Portable Operating System Interface. The 'X' is a remainder from the old
task force name 'IEEE-IX'. IT is continuously developed, last version in
2016: http://pubs.opengroup.org/onlinepubs/9699919799/
set keyboard language in debian:
dpkg-reconfigure keyboard-configuration
access timestamps on files:
the mount option 'noatime' switches tracking of access times off,
'relatime' leads to tracking with a threshold or combines it with the
'changed' timestamp. Finally, no mount option at all enables full
tracking.
nmap list scan:
nmap -sL 10.0.10.1-254
apt pinning:
https://linux.die.net/man/5/apt_preferences