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Sys.argv[] is used to get command line arguments, Sys.argv[0] represents the code itself file path, such as the cmd command line input ldquo;python test.py-helprdquo;, then sys.argv[0] is representative of ldquo;test.pyrdquo;. Sys.startswith () is used to determine what an object begins with, such as entering ldquo; '
1. symbol conventions
To facilitate the description of the format, we use some symbol conventions which are common:
C:
Drive letter
Path
Path
Filename
File Name
. Ext
Extension
Filespec
File Identifier
[]
The items in square brackets are optional. You can choose not to enter the content as needed.
{}
Braces indicate that one item is required.
|
A vertical line
Very useful command, which can be used to write software by yourself
Very good
You can use command-line parameters to change cCleaner's installation behavior, or to change how cCleaner runs.
Command-line parameters for cCleaner instils
There are three parameters you can use
files in Linux at any time by using commands.renameThe command renames the specified file according to the rules in the first parameter.The following command renames all .pdf files to a .doc file, using a rule that ‘s/\.pdf$/\.doc/‘ :
$rename-v‘s/\.pdf$/\.doc/‘*.pdf
Renaming multiple files in LinuxIn the following example, we will remove the extens
Tags: OCA arch core Price host express into is line operation1, Connection MySQL format: mysql-h host address-u user name-P user Password1. Connect to MySQL on this machine. First open the DOS window, then enter the directory Mysql\bin, and then type the command Mysql-u root-p, enter after the prompt you to lose the password. Note that the user name can have a space or no space, but before the password must
Linux Command Line has powerful functions. For skilled Linux system administrators, they only need to combine various techniques to form a complex command to complete user tasks.
How can a complicated Linux Command be made up? The following describes several tips.
Redirect using input/output
In Linux
/"in the loop are :"21 For a in 7 8 9 1122 do23 echo-n "$"24 done2526 echo27 echo2829 # In the READ command status30 echo-n "Enter/" /""31 read32 echo "the value of/" A/"is now $ ."3334 echo3536 exit 0################################ End Script ###### ###################################
3. location parametersIs the parameter passed in from the command line, $0, $
shown in Listing 1.
Listing 1. Two ways to declare the main () function
int main (int argc, char *argv[]);
int main (int argc, char **argv);
The first way to use a pointer to a char pointer array, which now seems very popular, is slightly clearer than the second (whose pointer points to multiple pointers to char). For some reason, I spent more time in the second way, which may have been the result of my hard learning of the C pointer in high school. Both methods are the same for all purpose
article through a few Hello world to feel. NET core new development experience.We're going to go through a Hello World example to learn the next dotnet command line, we've installed. NET Core 1.0 and can do the following:>dotnet New>dotnet Restore>dotnet RunImagine being with me when you compare this with the Visual Studio code that runs on Mac, Windows, and Lin
You can use the MySQL command line to back up and restore the database. The following describes how to use the MySQL command line to implement this function for your reference.
You can use the MySQL command line to back up and res
" or "enter" or "O" key to open the selected item Command+option+esc Key can be forced to quit the dead program Command+shift+3 (current screen)Command+shift+4 (free selection range)OPTION+F12 shutdown window (option to shut down, restart, sleep)Command+1 Display As IconCOMMAND+2 Display in column modeCommand+
create remote version (local version push to remote): $ git push origin [name] Delete remote version: $ git push origin: refs/tags/[name]
4) submodule related operation commandsAdd sub-module: $ git submodule add [url] [path] initialize sub-module: $ git submodule init ---- update the sub-module only once when the first warehouse is detected: $ git submodule update ---- run the following command to delete the sub-module after each update or switch br
Introduction to the 1.Linux command-line promptAs we all know, the Linux command line is the system administrator to manage the Linux important means, we manage the Linux, first face is the Linux command line prompt.The prompt at
The main function, which is a program entry point for developing a platform based on C, usually shows that our program seldom pays attention to the function main function parameter list, but simply gives the following case. int main () {System ("pause"); return 0;}Open MSDN, view the main function,Main (int argc, char *argv[], char *envp[]){Program-statements}First, let's take a look at the first two parameters, argc and argv[], these two are mainly used to describe the
. In addition, it is more useful to mirror the entire site, support agent browsing, and pause/reply downloads.Installing wgetBecause it is part of the GNU Project, Wget is bundled in most standard Linux distributions and no longer requires a standalone download installation. If it is not installed by default, you can also install it using apt or yum.# apt-get Install wget (APT-based system)# yum install wget (Yum-based system)Some basic usage of wgetUse wget to download a separate file.# wget ht
: UIDL [N] Same as above4.RETRCommand Format: RETR n parameter n is not saving, n is the mail number5.DeleCommand Format: Same as DELE n6.TopCommand Format: Top n m parameter n, m is not saving, n is the mail number, M is the number of rows7.NoopCommand Format: Noop requires no parameters8.QuitCommand Format: Quit does not require parametersFor detailed functions of each command, see the following description:1. The STAT
Recently, cc.net has studied how to place the generated publishing files on the FTP server as needed, so we have studied this information for sharing with friends:
1. FTP upload command:
Format: ftp-S: [configuration file] [FTP address]
For example, ftp-S: C: \ Vc \ ftpconfig.txt 211.155.224.210
The content of the ftpconfig.txt file is:
Username
PWD
Send test.rar
Quit
The first two commands are fixed, inclu
Command Line execution of django source code (2.0.2), django2.0.2
Preface
The django command line is frequently used in the whole django web development and must be used. Therefore, it is very helpful to understand the command line
Boot2013-06.log
Use the ls command
-L Option, The result is output in Long Mode:
[Root @ ay1301_135131135089 logs] # ls-l
Total 8
-Rw-1 root 5975 Jun 15 :34 boot2013-06.log
Show Hidden Files:
[Root @ ay1301_135131135089 logs] # ls-
... Boot2013-06.log
Command Option Parameters
Command-options arguments
In the following
The application layer protocol is the basis for socket communication, while supersocket directly has the commandlineprotocol ). The command line protocol is a widely used protocol. For example, common telnet, SMTP, POP3, and FTP protocols are all based on the command line pr
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