Linux/Prepare

In file: ~/.profile

• umask 002 (default), RW for user, RW for group and R for others - create dirs as 775 and files as 664
• umask 022 (default for root), 755 and 644
• umask 077 only RW for user, not other access
• umask 007 RW for user, RW for group

dpkg --add-architecture i386
apt-get update
apt-get install gpm tcpdump bmon tinc ppp pptpd mc links2 gparted hdparm smartmontools smart-notifier valgrind openssh-server
apt-get install wireshark mtr

1. Edit /etc/default/ntp and add “-s” argument.
2. Ordered List ItemInstall ntpdate and ntp
3. Ordered List ItemSwitch RTC to UTC time:

timedatectl set-local-rtc 0
ntpd -qg
hwclock --systohc

echo "blacklist pcspkr" > /etc/modprobe.d/nobeep.conf

apt-get install resolvconf

Add own nameserver into /etc/resolvconf/resolv.conf.d/base

nameserver 8.8.8.8

and execute

sudo resolvconf -u

dpkg-reconfigure keyboard-configuration
apt-get install console-data
dpkg-reconfigure console-data
dpkg-reconfigure locales

add

• pl_PL
• pl_PL.UTF-8

In Debian, locales are handled in /etc/default/locale. File /etc/environment is deprecated.

grep pam_env.so /etc/pam.d/*
...
/etc/pam.d/login:session       required   pam_env.so readenv=1
/etc/pam.d/login:session       required   pam_env.so readenv=1 envfile=/etc/default/locale
...

/etc/udev/rules.d/60-schedulers.rules

ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="cfq"
ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="deadline"  

cat /sys/block/sd*/queue/scheduler

There are 2 queues, one for read & one for write operations.

• none is just a First In First Out standard queue of I/O operations.
• cfq (Completely Fair Scheduling) is similar to the Round Robin algorithm and basically allots a fixed execution time for each I/O operation (they are implemented as a circular queue)
• deadline is like a priority queue with an aging concept. Basically it adds a deadline for each I/O operation & implements a priority queue

Supported in kernel >=4.12. It is disabled by default. To use multi-queue schedulers compile kernel with CONFIG_SCSI_MQ_DEFAULT=y or pass parameter scsi_mod.use_blk_mq=1 in boot loader.

Linux Multi-Queue Block IO Queueing Mechanism

/etc/udev/rules.d/60-schedulers.rules

ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="bfq"
ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="mq-deadline"

sudo udevadm control --reload
sudo udevadm trigger
cat /sys/block/sd*/queue/scheduler

To disable console annoying beep: * System wide by removing PC Speaker module:

rmmod pcspkr
sudo echo "blacklist pcspkr" > /etc/modprobe.d/pcspkr-blacklist.conf

sudo apt-get install wireshark cups

sudo usermod -G lp,lpadmin,dialout,sudo,audio,video,netdev,vboxusers,wireshark,kismet,i2c user_login

sudo apt-get install pigz pbzip2 pxz lbzip2

To force using parallel packers system-wide:

ln -s /usr/bin/lbzip2 /usr/local/bin/bzip2
ln -s /usr/bin/lbzip2 /usr/local/bin/bunzip2
ln -s /usr/bin/lbzip2 /usr/local/bin/bzcat
ln -s /usr/bin/pigz /usr/local/bin/gzip
ln -s /usr/bin/pigz /usr/local/bin/gunzip
ln -s /usr/bin/pigz /usr/local/bin/zcat
ln -s /usr/bin/pixz /usr/local/bin/xz

or use bash aliases:

.bashrc

alias gzip='pigz'
alias gunziip='unpigz'
alias bzip2='pbzip2'
alias bunzip2='pbunzip2'
alias xz='pxz'

some benchmarks (i7-3770K), BTRFS FS +NoCOW attrib

apt-get install git 
git config --global user.name "my name"
git config --global user.email myemail@address.pl
apt-get install git-cola etckeeper kdiff3

To handle old (not Unifying Receiver) Logitech product:

sudo apt-get install lomoco

sudo lomoco -i

003.005: 046d:c508 Receiver for Cordless Optical TrackMan (C-BA4-MSE) Caps: CSR SMS 
	Receiver type: C508
	Mouse type: Cordless Optical TrackMan
	Connect button on mouse pressed: no
	Active RF Channel: 1
	Battery status: 7 (full)
	Cordless security ID: 0x8e16
	Receiver talking: yes
	Lock Request (CONNECT button pressed): no
	Mouse Powerup (First time out of the box auto-locking): no
	Receiver Unlocked (Mouse disconnected): no
	Wait Lock (Searching for mouse): no
	Device physical shape type: 0
	SmartScroll (SMS): reporting not supported
	USB Mouse Polling Interval:  10ms

sudo lomoco --pid=C508 -i | grep -w "Battery status:"

For logitech devices there are additional packets: https://wiki.archlinux.org/index.php/Logitech_Marble_Mouse

Using CTM:

xinput set-prop "Logitech USB Receiver" "libinput Accel Speed" 1
xinput set-prop "Logitech USB Receiver" "Coordinate Transformation Matrix" \
2.000000, 0.000000, 0.000000, \
0.000000, 2.000000, 0.000000, \
0.000000, 0.000000, 1.000000