remarketing meaning

Variable Description:$$The PID of the shell itself (ProcessID)$!PID of the Shell's last running background process$?End code of the last Run command (return value)$-Flag at a glance using the SET command$*All parameter lists. such as "$*" in the Case of "" ", in the form of" $ $ ... $n "output all parameters.[Email protected]All parameter lists. such as "[email protected]" with "" "in the case, with" $ "" $ "... All parameters are output in the form "$n".$#Number of arguments added to the shell$

Http://kodango.com/useful-documents-about-shell$$ the shell itself PID (ProcessID)$! PID of the Shell's last running background process$? The return value of the last command that was run to check whether the previous command executed successfully.$* all parameter lists, as a whole.[email protected] all parameter lists. Alone as a whole.$# the number of arguments added to the shell.The file name of the Shell itself."Shell Learning Notes" $#,[email protected], explaining the

The compiler compliance setting tells the compiler to pretend it ' s a different version of Java.The Java 8 compiler would produce class files in the Java 8 version of the class file format, and accept Java 8 source file S. JRE 6 can ' t load this version, because it is created after JRE 6 is.If you set the compliance level to "JRE 6", it would instead compile Java 6 source files into Java 6 class files.It's like saving a Word document as "word 97-2003 format"-so that word 97-2003 can read your

The execution name of this program$n the nth parameter value of this program, n=1..9$* all parameters of this program, this option can have more than 9 parameters.$# the number of parameters for this program$$ the PID of this program (the current process ID number of the script run)$! PID of the previous background instruction (process ID number of the last process running in the background)$? Executes the return value of the previous instruction (displays the exit status of the last command. 0

restore it.B. Want to make the user name shorter.Method: Create a new User: sudo adduser yy (yy means your new username)Enter the password for your root user.Then enter the password for your new user xxxAfter the full name, room number, telephone, etc. do not need to fill in.So you create a new user, directly with this user can be.C Delete the original usersudo userdel zzz (zzz means your original username) If your user is logged in, you need to exit. Otherwise it cannot be erased.The

now.W S Process state. (d= non-disruptive sleep status, r= run, s= sleep, t= track/Stop, z= zombie process)x command name/command lineY Wchan If the process is sleeping, the system function name in sleep is displayedZ Flags task Flag, reference sched.hBy default, only the more important PID, USER, PR, NI, VIRT, RES, SHR, S,%cpu,%MEM, time+, and COMMAND columns are displayed. You can change the display by using the following shortcut keys.The F key allows you to select what is displayed. Press t

Public classTest { Public Static voidMain (string[] args) {//under normal circumstances, the corresponding ASCII code is stored in the 0,TP . CharTP = ' 0 '; System.out.println ((int) TP); //added \ means that the following 0 is an escape character, for special handling, this escape means that 0 is not the same as the original character 0, when the compiler encounters this, it will automatically//conversion to decimal 0 is stored in CH, and the characters in the ASCII code corresponding t

Note: This article is reproduced in the networkThe man in Linux is very powerful, and the manual is divided into sections, which can be used to specify a different section to navigate, with each section having the following meanings:1-commands2-system calls3-library calls4-special files5-file formats and Convertions6-games for Linux7-macro Packages and conventions8-system Management Commands9-OtherExplain,1 is a normal command.2 is a system call, such as open,write (through this, at least can be

EOF is a macro, which is generally defined as-1.1.EOF is used to determine the end of the document (end of file) in the file operation, you can check MSDN to see its definition: EOF is returned by an I/O routine when the end-of-file (or in some CA SES, an error) is encountered2.EOF indicates the end of the input stream.3. After the send-side socket is closed, the read function of the receiving end reads the socket will also return EOF.The meaning of E

Tag: Service expression denotes blog sample sign on () expression impExecution (*com.sample.service.impl. *.*(..))Symbolic meaningExecution () the subject of an expressionThe first "*" symbol indicates any type of return value;Com.sample.service.implAOP the package name of the service being cut".." After the package name Represents the current package and the child packageThe second "*" denotes the class name, which is all classes. can be customized.*(..) Represents any method name, parentheses

The most essential difference between the SU command and the Su-command is that the former simply switches the root identity, but the shell environment is still the shell of the normal user, and the user and the shell environment are switched to root. The PATH environment variable error does not occur unless you switch the shell environment. After the SU switch to the root user, PWD, found that the working directory is still the normal user's working directory, and after the Su-command switch, t

-Number between 0.00-1.00 NormalThe road manager will tell the driver that if the front is more congested, the driver will have to wait, if the front way unimpeded, then the driver can drive directly.Specifically:The numbers between the 0.00-1.00 indicate that the traffic is very good at this time, without congestion, and the vehicle can pass without hindrance.1.00 means the road is normal, but it is likely to worsen and cause congestion. At this point the system has no redundant resources, the

thread and for process as A whole (see Pthreads (7) and Signal (7)) . * sigblk, sigign, sigcgt:masks indicating signals Being blocked, ignored, and caught (see signal (7)) . * Capinh, CAPPRM, capeff:masks of caps Abilities enabled in inheritable, permitted, and effective sets (see capabilities (7)) . * Ca Pbnd:capability bounding set (since kernel 2.6.26, see capabilities (7)) . * cpus_allowed:m Ask of CPUs on which this process could run (since Linux 2.6.24, see Cpuset (7)) . * Cpus_allow

The BIOS has a cure code pointing to mbr,mbr pointing to Grub (/boot/grub/has a lot of boot configuration information), and grub can configure a variety of Linux kernel vmlinux files. Starting the kernel starts loading various driver modules and initializing the system. System initialization mainly reads/etc/inittab (specify default runlevel) and/etc/init/under various profiles (specify default startup service, number of endpoints, shortcut keys ...). ), the system starts to complete after runni

stat: $?"The result of the execution is:[@jihite]$SHDel.SH 1 2 3Number :3Scname:del.SHFirst :1Second:2Argume:1 2 3show Parm list:1 2 3Show ProcessID:21057Show PrecommStat:0Example two:1#!/bin/SH2num=$#3name=$04 Echo "Number : $num"5 Echo "scname: $name"6 Echo$07 Echo$18 Echo$29 Ten for((i=0; i)) One Do A Echo "$i" - Done - the Echo "Argume:[email protected]" - forKeyinch[email protected] - Do - Echo$key + Done - Echo "-----------------" + forKeyinch "[email protected]" A Do at

Format string formatted, must be one by one corresponding' I am {}, age{},{} '. Format ('seven',',') print (TPL)' I am {1}, age{2},{2} '. Format ('seven',',') print (TPL)Take a tuple firstTPL = ' I am {0[0]} ', Format ([1,2,3],[123])function definition methods in Python:def Test (x): ' The function Definitions ' #注释函数 x+ =1 return Xdef: A keyword that defines a functionTest: Name of function(): Internal Medicine defined formal parameters' Document description, not necessary, strongly r

In Linux, you can take advantage of symbols: "|" To implement pipeline functions,So what is the plumbing function:Piping is a feature of the shell, and he connects multiple commands to form a pipe flow,Each command in the pipeline flow runs as a separate process,The output of the previous command the input of a command after the seat,Execute each command sequentially from left to rightFor example:Use the "ls--help|more" command to display Help for the "LS" command, because the help information i

First of all, I set the socket to asynchronous, and then when I use write to send data, the way is to loop a large amount of data, because it is asynchronous, Write\send will send the data submitted to the send buffer is immediately returned, do not need to confirm the data received. In this case, it is quite possible that the send buffer is filled up, causing the write\send to no longer commit the data to be sent to the buffer. So there is the resource temporarily unavailable error, Eagain

tree--lists directories and files in tree formUnder Linux, the colors of different files represent meaningBlue--CatalogueWhite--General documents, text, configuration, source code, etc.Light blue--linked files, mainly files created by the LN commandGreen file--executable fileRed file--compress file or package fileQuestion: Today, when I look at the source code, there is a problem, that is, when I click on a class or method, it will not jump to their definition of the beginning of the placeResolu

means that you rarely need to create it yourself.As hardware moves out of the computer, the names become more blurred. Fortunately, today's high-grade software blocks on Linux use easy-to-understand names for history and hardware. For example, well, Pango (http://www.pango.org/) is one of them.If you are interested in these things, then I suggest you read the grand, but some of US English history-centric, written by Eric S. Raymond Jargon File. It does not explain all the terminology used in Un