print 1 2 3

From: http://blog.chinaunix.net/space.php? Uid = 22133229 & do = blog & id = 1790099 Awk usage: awk 'pattern' {action }' Variable name meaningNumber of ARGC command line VariablesARGV command line meta ArrayFILENAME current input file nameNumber of

The full arrangement refers to the number of n (or other characters) of all possible permutations, such as 1 2 33 digits of the full arrangement is1 2 31 3 22 1 32 3 13 1 23 2 1So the question comes, arbitrarily enter a number greater than 1 N,

string:All methods do not modify the value of the string, the string is the original value, but can be re-assigned; Use string methods to return a valueTo use a looping string:String method:Name= "Hello World"Print (Name.capitalize ()) #首字母大写Print

First, the computer composition1. HardwareCPU, used to calculateRAM, for storing immediate dataROM, storing dataInput Devices, Output Devices2. Software(1) Operating systemWindowsLinuxMac OSDosFor data interaction between computer hardware(2)

Python Language Specification Pychecker? Run Pychecker definition for your code: Pychecker is a tool for finding bugs in Python source code. For less dynamic C and C + + languages, these bugs are usually captured by the compiler. Pychecker and lint

Variables in Python do not need to be declared. Each variable must be assigned before it is used, and the variable will not be created until the variable is assigned.In Python, a variable is a variable, it has no type, and what we call "type" is the

Name= "I have a beautiful flower"Print (Name.capitalize ()) #使name中的首字母大写Print (Name.count ("a")) #统计name中a的个数Print (Name.center, "-") #使name中的字符数一共为30个字符, not enough-fillPrint (Name.endswith ("Flower")) #判断字符串是否以flower结尾, can be used to determine

I. Introduction of AWKawk: Report Generator, which is processed in behavioral units and displayed after formattingAwk is a powerful text analysis tool, with the search for grep and the editing of SED, which is especially powerful when it comes to

For several days did not review, the skull has responded but came, was asked to own research, absolute SB, naught! Hope to receive a phone call tomorrow, enter the desire of e-commerce company! 1, a SQL statement query very slow how to do?A: (1) Log

#!/bin/bash#createdate: 2016-11-15Date= ' date+%f ' "%h:%m"ip= ' Ifconfigeth0 | awk '/inet addr/{print $} ' | Cut-d:-f2`Echo-e "\033[032mdate: $Date \nhost: $IP \n\033[0m"echo-----------------CPU----------------Cpu_us= ' Vmstat|awk ' {print $13} '

#!/bin/bash#createdate: 2016-11-15Date= ' date+%f ' "%h:%m"ip= ' Ifconfigeth0 | awk '/inet addr/{print $} ' | Cut-d:-f2`Echo-e "\033[032mdate: $Date \nhost: $IP \n\033[0m"echo-----------------CPU----------------Cpu_us= ' Vmstat|awk ' {print $13} '

#!/bin/bashecho "Current datetime is:" ' Date 'echo "Hello world!"#使用变量: You can use single or double quotation marksYour_name= "Wang"Echo $your _nameEcho ${your_name}Str= ' Shellstudy 'Echo ${str}#只读变量: Cannot change its valueMyurl=

To set the default startup WIN7:Terminalsudo gedit/boot/grub/grub.cfgSet default= "0" changed to set default = "4" (typically 4)I. File/Folder ManagementLS lists the current directory file (excluding hidden files)Ls-a list current directory files

First, remove the number of occurrences of the shell in the/etc/passwd file: Here is a partial content of a/etc/passwd file. The topic asks to take out the shell and counts the number, the shell refers to the back/bin/bash,/sbin/nologin and so on,

I. File/folder ManagementLS lists the current directory file (excluding hidden files)Ls-a list current directory files (including hidden files)Ls-l list the files in the current directory for more informationCd.. Back to the top-level directory of

Regular Expressions:To put it simply, regular expressions are a set of rules and methods for handling strings, dealing with strings in behavioral units, and with special symbolic assistance, we can quickly filter and replace certain

As a beginner, just contact the regular expression, it must be confused, but it doesn't matter, use examples to illustrate.==*==*==*==*==*==*==*==*==*==*==*==*==*==*==*==*==*==*==*==*==*==* ==*==*First, take a look at what the regular expression

Old boy Education daily-day 126th-print multiplication tables with shell scriptsIssue background: Generate 9*9 multiplication table[[email protected] ~]# SEQ 9 | Sed ' h;g ' | Awk-v rs= ' {for (i=1;iProblem analysis Solution First step: Seq 9[[email

Python 2.4 vs. Python 3.0One, the print from the statement into a functionOriginal: Print 1, 2+3Instead: Print (1, 2+3)Two, range and xrangeOriginal: range (0, 4) result is list [0,1,2,3]Instead:list (range (0,4))Original: xrange (0, 4) variable

#!/usr/local/bin/python3#-*-coding:utf-8-*-name= "My wife is Mahongyan" #----------capitalized----------#print ( Name.capitalize ()) #----------character Statistics----------#print (Name.count (' m ')) #----------character beautiful