A kernel driver is necessary to initalize the tablet and translate hardware-specific protocols into standard input events. We contribute patches directly to the Linux kernel, as well as maintain an out-of-tree kernel module that enables old kernels to work with many newer tablets.

For compatibility head also supports an obsolete option syntax -[num][bkm][cqv], which is recognized only if it is specified first.

‘-n [-]num’ ‘--lines=[-]num’ Output the first num lines.

‘-c [-]num’ ‘--bytes=[-]num’ Print the first num bytes, instead of initial lines.

the concept of magic numbers goes back to unix and pre-dates the use of file extensions. The original idea of the shell was that all 'executable' would look the same - it didn't matter how the file had been created or what program should be used to evaluate it. The shell would look at the contents of the file and determine the appropriate file. Microsoft came along and chose a different approach and the era of file extensions was born. Then to make things 'nicer' for users microsoft chose to 'hide' these extensions and the era of trojan files which look like they are of one type but really have a different extension and are processed by a different file was born.

print every nth line into a row

exec newgrp <newlyaddedgroupname1>

Analyzing NFS Client Performance with IOzone

Edimax EW-7811UTC

Wireless Network Speed, Signal Strength And Other Information

AC600 Wireless Dual-Band Mini USB Adapter EW-7811UTC

iw is a new nl80211 based CLI configuration utility for wireless devices

Reinstalling a kernel from a chroot

article covers the ATI/Radeon open source driver for older cards

How to troubleshoot NFS transfer latency issues using “nfsiostat”

Tune NFS Performance

Cloning Encrypted SSD to larger SSD

RHEL mount hangs: nfs: server [...] not responding, still trying

stop LVM group prior to stop cypher

dm-crypt wipe on an empty disk or partition

Add Users To "audio" Group

Multi-Seat on Linux

“The number of moving parts is so vast, and several of them are under the control of different groups. There’s no way you could ever pull it together into an integrated system in the same way as you can in a single commercial product with, you know, a single maniac in the middle.”

1) <hex_major><hex_minor> device number in hexadecimal represents itself * no leading 0x, for example b302. * 2) /dev/nfs represents Root_NFS (0xff) * 3) /dev/<disk_name> represents the device number of disk * 4) /dev/<disk_name><decimal> represents the device number * of partition - device number of disk plus the partition number * 5) /dev/<disk_name>p<decimal> - same as the above, that form is * used when disk name of partitioned disk ends on a digit. * 6) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the * unique id of a partition if the partition table provides it. * The UUID may be either an EFI/GPT UUID, or refer to an MSDOS * partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- * filled hex representation of the 32-bit "NT disk signature", and PP * is a zero-filled hex representation of the 1-based partition number. * 7) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation to * a partition with a known unique id. * 8) <major>:<minor> major and minor number of the device separated by * a colon.

How to Determine the Amount of RAM Slots In Use?

How to setup a UFW firewall on Ubuntu 16.04 LTS server

All NFS mount options have good points and bad points

autofs is a program for automatically mounting directories on an as-needed basis.

To understand why the DPI is important, consider these two plots:

A couple of tricks with the secure shell

newgrp adm

Client Configuration Set up ~/.ssh/config

cp -r /etc/skel/. /home/<new_user>

You terminate a session by killing its parent process, called the session leader. Find out which process it is with: ps -dN|grep pts/3

There are many color schemes which are usually distributed together with vim

Ubuntu bluetooth bugs

echo 1 > /sys/block/(whatever)/device/delete

0 6 * * * /root/zwk/test.sh >> /root/zwk/operate_`date +"\%Y\%m\%d"`.log 2>&1

Linux cluster sysadmin -- OS metric monitoring with colmux

find . -type d \( -path dir1 -o -path dir2 -o -path dir3 \) -prune -o -print

BASH: Create User Accounts with Random Password

How to Change a USER and GROUP ID on Linux For All Owned Files

while IFS='=' read -r col1 col2 do echo "$col1" echo "$col2" done <testprop.properties

In Bash you quite often need to check to see if a variable has been set or has a value other than an empty string. This can be done using the -n or -z string comparison operators.

/dev/sda

Finding Files

find /volume1/Movies /volume1/Music /volume1/Photos "/volume1/Home Videos" "/volume1/Music Videos" -type d -exec chmod 755 {} \;

/dev/cdrom on /mnt/cdrom type iso9660 (ro,nosuid,nodev)

The name to use to register the guest operating system

Mounting file systems over two SSH hops

Associative arrays in bash

How to Set Up Bluetooth in Linux

Restoring The Menu Panel on Linux Mint Cinnamon

How can I capture STDERR from an external command?

Multiple Boot Systems Time Conflicts

scan all blocks of your partitions

If zone reclaim is switched on, the kernel still attempts to keep the reclaim pass as lightweight as possible. By default, reclaim will be restricted to unmapped page-cache pages. The frequency of reclaim passes can be further reduced by setting /proc/sys/vm/min_unmapped_ratio to the percentage of memory that must contain unmapped pages for the system to run a reclaim pass. The default is 1 percent.

There is a knob in the kernel that determines how the situation is to be treated in /proc/sys/vm/zone_reclaim. A value of 0 means that no local reclaim should take place. A value of 1 tells the kernel that a reclaim pass should be run in order to avoid allocations from the other node. On boot- up a mode is chosen based on the largest NUMA distance in the system.

There has been some recent work in making the scheduler NUMA-aware to ensure that the pages of a process can be moved back to the local node, but that work is available only in Linux 3.8 and later, and is not considered mature.

The active memory allocation policies for all memory segments of a process (and information that shows how much memory was actually allocated from which node) can be seen by determining the process id and then looking at the contents of /proc/<pid>/numa_maps.

firefox -ProfileManager

Just use SSH’s support for SOCKS5 proxy.

Welcome to the Dovecot Wiki

.

strings $PWD/bin/myapp | egrep '\.gcda$'

Create a script in your encrypted home directory: ~/scripts/mount_storage.sh

华为的Li Zefan同学

Linux CGroup全称Linux Control Group， 是Linux内核的一个功能，用来限制，控制与分离一个进程组群的资源（如CPU、内存、磁盘输入输出等）。

tar -zxvf target/secor-0.1-SNAPSHOT-bin.tar.gz -C ${SECOR_INSTALL_DIR}

npm install --save-dev webpack webpack-dev-server react-hot-loader

sudo npm install --save-dev webpack-dev-server -g

Linus Torvalds

In 1991

sudo update-alternatives --config x-www-browser

Firefox

A shell script is a file of executable commands that has been stored in a text file. When the file is run, each command is executed.

select proprietary or out-of-tree modules (ex. vitualbox, nvidia, fglrx, bcmwl, etc.)

Counting number of lines

-print0