, separated by colons. Within the last field, the default login shell is:root:x:0:0:root:/root:/bin/bash. . .demouser:x:1000:1000:,,,:/home/demouser/bin/bashIf the last field is/bin/bash, the setting is complete.If the last field is not/bin/bash and you want to change the default shell to bash, you can edit the file with root permission and change the last field associated with the user:sudo nano /etc/passwdAfter the change is complete, log out and return to use the bash shell.View current value
separators, typically space characters, tab characters, and line breaks, are used to divide the fields of words generated by the command substitution, the table in the looping structure, and the read input
LANG is used to determine the locale class for a type that is not explicitly selected with a variable starting with LC_
Oldpwd Previous working directory
Path command to search for paths. A list of directories separated by colons, which the shell uses to search for commands, a common value of
computer to work properly. Analysis failure: From the phenomenon, the USB device and motherboard interface are not damaged, suspected to be accidental power loss caused system setup error. Problem handling: Enter the Add and Remove Hardware window from the Control Panel, remove all USB devices, and reinstall the USB device drivers that you need to use. Restart the computer, U disk and other USB devices plug in the original fault interface to work properly. Unrecognized USB device-laptop hard dr
The workaround is as follows:
1, first of all, if your mouse appears no response to the situation, you pull the mouse down, and then plug into another computer USB jack above, just plug in May not recognize the system, so, in this case you'd better restart first, and then the general problem will be solved.
2, if changed the socket, and also reboot, but the mouse is still not responding, then you have to consider whether the current mouse driver has been damaged. If your system is
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it is not set to open, Then Windows naturally cannot detect the removable hard drive. To solve this problem, we can reboot, enter the CMOS Setup window, and in the "Pnp/pci CONFIGURATION" column, "Assign IRQ for USB" is set to "Enable", This allows the system to assign an available interrupt address to the USB port.
Second, the power supply is insufficient
Because the USB hard disk in the work also need to consume a certain amount of electricity, if directly through the USB interface to take
be accidental power loss caused system setup error.
Problem handling: Enter the Add and Remove Hardware window from the Control Panel, remove all USB devices, and reinstall the USB device drivers that you need to use.
Restart the computer, U disk and other USB devices plug in the original fault interface to work properly.
Unrecognized USB device-laptop hard drive failure and removable hard drive, plugged in front USB connector, unrecognized.
A big reason for this is the power su
devices, reinstall the USB device drivers that you need to use. Restart the computer, U disk and other USB devices plug in the original fault interface to work properly. Unrecognized USB device-laptop hard drive failure and removable hard drive, plugged in front USB connector, unrecognized. This situation, a big reason is the power supply problem. Because the USB hard disk in the work also need to consume a certain amount of electricity, if directly through the USB interface to take electrici
First, set the CMOS parameters
For a friend who has never used a USB add-in, it is possible that the system cannot detect a USB hard drive even if the driver is properly installed, mainly because the default CMOS port on the motherboard is turned off, and if it is not set to open, Then Windows naturally cannot detect the removable hard drive. To solve this problem, we can reboot, enter the CMOS Setup window, and in the "Pnp/pci CONFIGURATION" column, "Assign IRQ for USB" is set to "Enable", Th
seems that this is learning methods and habits of the problem.So I observed that there was a mistake: can not open input device Dev/psauxThis is the problem of the mouse, did not find the file, just at the beginning I thought from someone else's machine to copy this file may be solved (found U disk can not be very good copy not down), and later found in the dev/.static/dev/under the file, and then copied to the/dev/directory, Restart still did not solve the problem, then found that the copy of
controller GPIO and UART
The AMBA peripheral documentation set contains the following technical reference manuals (TRM), data manuals, and technical overviews: AMBA controllers and Peripherals Pl01x-uart ARM Primecell®technical Reference Manual Primecell®uart (PL011) Technical Reference-Manual UART (Primecell) PL011 Reference Manual pl02x-synchronous serial port ARM Primecell synchronous Port (serial Technical Reference Manual pl03x-real time Clock ARM primecell™technical Reference M Anual
transmission with a much higher transmission rate than SPP, up to 2Mbps, and there are many peripherals that use this mode of operation. 3. ECP expansion type working mode. ECP uses bidirectional full-duplex data transmission, the transfer rate is higher than EPP, but the support of the equipment is not many, is now nearing elimination, we just need to understand.
Confusing case due to interface what is the most appropriate mouse insertion?
The secret of the Backplane interface
In a com
DriverManager.PS1: Class.forName (string) differs from Classloader.loadclass (string)Class.forName (String): Loads the class and performs class initialization; the second parameter can be Class.forName (string, Boolean, ClassLoader) to simply load a class without initializing; Classloader.loadclass (String): Loads the class only, does not perform class initialization;PS2: Sometimes you see this usage: Class.forName ("Com.mysql.jdbc.Driver"). newinsta
/music‘(iii) deleting aliasesTo delete an alias with the unalias command:Observation, the music alias was deleted. A small problem, if the alias and command name conflict, who should be executed first?See, as a matter of fact, the implementation of LS, the result is entered into the/etc/samba directory. What if the LS definition deletes a file? Dead don't know how to die ...Iii. Custom PromptsThe prompt is waiting for the user to enter the command section. Such as:There are two common types of p
determine the locale class for a type that is not explicitly selected with a variable starting with LC_Oldpwd Previous working directoryPath command to search for paths. A list of directories separated by colons, which the shell uses to search for commands, a common value of/usr/gnu/bin:/usr/local/bin:/usr/ucb:/usr/binPPID Process ID of the parent processPS1 main prompt string, default value is $PS2 prompt string, default value is >PS3 the Select Pro
/shell_workspace$./searchfile.sh parm.sh./parm.shCan see, find it, and print it out.4) Standard variablesBash establishes some standard environment variables by default, which can be defined in/etc/profile, mainly Exinit,home (home directory), IFS (default delimiter), Logname,mail,mailcheck (default), Mailpath, PATH,PSI,PS2 (used to run multiple commands on one line), Shell,term (terminal), TZ (timezone), PWD (current directory), MANPATH (Help documen
First, set the CMOS parameters
For a friend who has never used a USB add-in, it is possible that the system cannot detect a USB hard drive even if the driver is properly installed, mainly because the default CMOS port on the motherboard is turned off, and if it is not set to open, Then Windows naturally cannot detect the removable hard drive. To solve this problem, we can reboot, enter the CMOS Setup window, and in the "Pnp/pci CONFIGURATION" column, "Assign IRQ for USB" is set to "Enable", Thi
, the USB device and motherboard interface are not damaged, suspected to be accidental power loss caused system setup error.
Problem handling: Enter the Add and Remove Hardware window from the Control Panel, remove all USB devices, and reinstall the USB device drivers that you need to use. Restart the computer, U disk and other USB devices plug in the original fault interface to work properly. Unrecognized USB device-laptop hard drive failure and removable hard drive, plugged in front USB conne
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