Learn Basic UNIX commands

Basic UNIX commands
Note: not all of these are actually part of UNIX itself, and you may not find them on all UNIX machines. But they can all be used on turing in essentially the same way, by typing the command and hitting return. Note that some of these commands are different on non-Solaris machines -
If you've made a typo, the easiest thing to do is hit CTRL-u to cancel the whole line. But you can also edit the command line
UNIX is case-sensitive.
Files
• ls --- lists your files
ls -l --- lists your files in 'long format', which contains lots of useful information, e.g. the exact size of the file, who owns the file and who has the right to look at it, and when it was last modified.
ls -a --- lists all files, including the ones whose filenames begin in a dot, which you do not always want to see.
There are many more options, for example to list files by size, by date, recursively etc.

Power On Self Test Beep Codes for a specific meaning

BIOS for the Award BIOS's a short: the system start normally. BIOS for the Award BIOS's a short: the system start normally. Congratulations, your machine without any problem. Congratulations, your machine without any problem.
2 Short: General error, please enter CMOS Setup, reset the incorrect option. 2 Short: General error, please enter CMOS Setup, reset the incorrect option.

What is CMOS?

BIOS is stored in CMOS memory, CMOS is a complementary metal-oxide semiconductor initials of the first to write Chinese is a complementary metal-oxide semiconductor, which is a semiconductor technology that will become the right of the metal-oxide semiconductor field-effect transistor (MOSFET) integrated on a silicon chip. BIOS is stored in CMOS memory, CMOS is a complementary metal-oxide semiconductor initials of the first to write Chinese is a complementary metal-oxide semiconductor, which is a semiconductor technology that will become the right of the metal-oxide semiconductor field-effect transistor (MOSFET) integrated on a silicon chip.

Diode characteristics and applications

In almost all electronic circuits, it is necessary to use semiconductor diode, which in many circuits play an important role, it is the birth of one of the first semiconductor device, its applications are very extensive.

Diode Diode works works

Crystal diode as a p-type semiconductor and n-type semiconductor pn junction formed in its interface on both sides of the formation of space charge layer, and built self-built electric field. Crystal diode as a p-type semiconductor and n-type semiconductor pn junction formed in its interface on both sides of the formation of space charge layer,

In-depth understanding of the hard disk structure

Opened an in-depth understanding of the hard disk data recovery must be preceded by the overall physical structure of the hard disk have a full understanding. As a high precision parts, hard disk external structure is relatively simple, the real high-tech body in its internal disk. As a high precision parts, hard disk external structure is relatively simple, the real high-tech content in its body within the disc.
1. The external structure of the hard disk 1. The external structure of the hard disk
Hard drive external structure is not complicated, mainly by the power supply interface, data interface, the control circuit board composition. Hard drive external structure is not complicated, mainly by the power supply interface, data interface, the control circuit board composition. For IDE hard drives, Serial-ATA hard drive, SCSI For IDE hard drives, Serial-ATA hard drive, SCSI

CPU fan noise removal method

The most important tool as a computer cooling fan, but also because the use of high frequency, resulting in noise is increasing. Faced with this situation, you thought the noise eradicated there? Faced with this situation, you thought the noise eradicated there? Perhaps you will say the fan is not on the line of direct replacement, but in fact as long as the fans do not bad, there is no need to replace with new, old fans as long as proper maintenance, can be returned to normal. Perhaps you will say the fan is not on the line of direct replacement, but in fact as long as the fans do not bad,

Method of hard disk damage repair

1, hard disk damage test, if there part of the sector on the hard disk can not be properly read or write or visit the situation, the general was known as a bad fan (bad sector), which is commonly known as "bad sectors . "hard disk bad sectors is very complex, and some recorded in the sector by the checksum code, sector identification, address information, which do not normally lead to logical errors. Hard disk bad sector the situation is very complex, and some recorded in the sector by the checksum code, sector identification, address information, which do not normally lead to logical errors.

windows crashes, blue screen error code meaning of the whole solution of

Computer Blue Screen
0 0x0000 job is completed. 0 0x0000 job is completed.
1 0x0001 Incorrect function. 1 0x0001 Incorrect function.
2 0x0002 system can not find the file specified. 2 0x0002 system can not find the file specified.
3 0x0003 system can not find the path specified. 3 0x0003 system can not find the path specified.
4 0x0004 system can not open the file. 4 0x0004 system can not open the file.
5 0x0005 Access is denied. 5 0x0005 Access is denied.
6 0x0006 invalid code. 6 0x0006 invalid code.
7 0x0007 storage control block has been destroyed. 7 0x0007 storage control block has been destroyed.
8 0x0008 storage space, unable to process this command. 8 0x0008 storage space, unable to process this command.

SDRAM memory repair method

An SD memory maintenance practices, use multimeter measuring method of memory chips

On the motherboard and memory data pins is 64, D0-D63, in order to protect the memory data bit feet, in the D0-D63 which 64 data bits plus feet with a small resistance resistor (10 EU) threshold flow effect. On the motherboard and memory data pins is 64, D0-D63, in order to protect the memory data bit feet, in the D0-D63 which 64 data bits plus feet with a small resistance resistor (10 EU) threshold flow effect. While the test Instrument The main principle is to repeat tests with the program memory chips of each data bit pin to see if there is no breakdown or short circuit pin data bits, there is a chip's clock pin, the address pins.

ATX power supply of knowledge

At present, ATX power supplies are widely used in computers, compared with the AT power supply, it is more in line with "green computer" energy-saving standards,
It corresponds to the motherboard is the ATX motherboard. It corresponds to the motherboard is the ATX motherboard.

1.ATX power characteristics of 1.ATX Power Characteristics

Compared with the AT power supply, ATX power supply increases "+3.3 V, +5 VSB, PS-ON" three outputs. Compared with the AT power supply, ATX power supply increases "+3.3 V, +5 VSB, PS-ON" three outputs. Which "+3.3 V" output is mainly for the CPU use, and "+5 VSB", "PS-ON" ATX power supply output is embodied characteristics. In which "+3.3 V" output is mainly for the CPU use, and "+5 VSB", "PS-ON" while the output reflects the ATX power supply features.

Memory fault diagnosis and maintenance of

Computer memory is the most prone to failure of accessories one of the products, if the power is in the press box or a computer chassis alarm horn can not be repeated self, in most cases due to memory failure. While in all kinds of memory failures are basically destroyed the main memory, when we tend to lose the memory will be destroyed after a direct replacement in the side of the memory. In all kinds of memory failures are basically destroyed the main memory, when we tend to lose the memory will be destroyed after a direct replacement in the side of the memory. Because of memory compared with other cheaper parts, resulting in a lot of a friend once the machine memory problems detected, but not through any direct replacement of memory processing, resulting in great waste.

Chassis Front USB Connection

First, an overview because each USB peripheral interface able to provide +5 V500MA current, when we connected on-board USB interface, must be in strict accordance with the motherboard manual for installation. Absolutely not an error, or they will burn the motherboard or a peripheral. Definitely not an error, or they will burn the motherboard or a peripheral. I believe there are a lot of friends in the USB plug to connect front-line similar happened when the "smoking something,

Epson Stylus printer print head fault repair

Although the ink-jet printer and laser printer is currently very popular office equipment, but the stylus printer still in the financial, commercial areas such as a wide range of applications, which was mainly due to stylus printer has a low price, the use of economic, technological maturity etc., and stylus printer there are a number of specialized uses, such as printing more bills, etc. together. Of course, it also has a disadvantage that is a high failure rate, and its print head failure again of the total fault the rate of about 70%, below the print head for everyone to talk about the failure of maintenance of way. Of course, it also has a disadvantage that is a high failure rate, and its print head failure also accounted for 70% of the total failure rate of about Here's to talk to you about the repair method of print head failure.

Three main points of the motherboard repair

1, non-maintenance of electricity
1, Southbridge (electricity) 1, Southbridge (electricity)
2, I / O (power supply) 2, I / O (Power)
3, the door circuit (VCC) 3, the door circuit (VCC)
4, XY (both ends voltage) 4, XY (both ends voltage)
5, COMS battery 5, COMS battery
6, Jump (jumper cap) 2.5V-3.3V 6, Jump (jumper cap) 2.5V-3.3V
7, Power-on is not level transistor 5V 7, Power-on is not level transistor 5V
8, 5VSB 8, 5VSB

Hard disk damage restoration

Hard disk damage restoration of hard disk is a very important part of the computer, all information and data will be stored in the hard disk, once the hard disk errors, and sometimes the loss of data than the loss of computers become obsolete as a whole even more significant. However, as computer hardware, and many people think of the hard disk is not easy to be easily damaged, can not be started once the bad is the situation, as well as people think that is very easy to identify bad sectors,

ALL KEY BOARD SHORT CUTS AND COMEN COMMANDS

F1 Help
F2 renamed F2 renamed
F3 Search for F3 Search
F4 Address F4 Address
F5 Refresh F5 refresh
F6 Switch F6 Switch
F10 Menu F10 Menu
CTRL + A Select All CTRL + A Select All
CTRL + C to copy CTRL + C to copy
CTRL + X Cut CTRL + X Cut
CTRL + V Paste CTRL + V Paste
CTRL + Z Undo CTRL + Z Undo
CTRL + O Open CTRL + O to open

How to enter Samsung 171S LCD factory pattern?

Boot mode, the OSD menu, the brightness and contrast values will be adjusted to 0,

how to repair bb5 contact service

problem:contact service

tools i use:
jaf w/pkey orig
ufc cable

procedure:

*info in jaf software

XP REPAIR INSTALL

XP INSTALL

1. Boot the computer using the XP CD. You may need to change the
boot order in the system BIOS. Check your system documentation
for steps to access the BIOS and change the boot order.

2. When you see the "Welcome To Setup" screen, you will see the
options below This portion of the Setup program prepares Microsoft
Windows XP to run on your computer:

Remove newfolder.exe virus

1. Cut The Supply Line
1. Search for autorun.inf file. It is a read only file so you will have to change it to normal by right clicking the file , selecting the properties and un-check the read only option
2. Open the file in notepad and delete everything and save the file.
3. Now change the file status back to read only mode so that the virus could not get access again.
4. Autorun INF: cutting the supply line

USING SONY ERICSSON SETOOL2

Setool2 Lite is a free program that will allow us to customize our phones flash and Sony Ericsson DB2020 CID49/51/52 and DB2010/DB2012 CID49/50/51/52.

NOTE: To connect in flash mode. Turn off the phone, remove and reinsert the battery without turning the phone press and hold the key "C" then connect the cable, one recognizes the phone see release "C".

Basic functions.

Unlock / Repair: Allows you to read the phone lock code, it is NOT to release the net.

Flash: To start the process of updating / flashing.