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In linux, the meanings of shell variables $ #, $ @, $0, $1, $2, Variable description $ Shell PID (processID) $! The background ProcessID of the last shell Running $? End code of the last command (return value) $- Flag overview Set by using the Set command $ * List of all parameters. For example, if "$ *" is enclosed by "$1 $

Tags: file run BSP case background POS linux lis Linux The meaning of shell variable $#,[email protected],$0,$1,$2 in Linux is explained: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 ""

Shell variables in Linux $#, [e-mail protected],$0,$1,$2 meaning explanation:Variable Description: $$ the shell itself PID (ProcessID) $! What is the PID of the Shell's last running background process? End code of the last Run command (return value) $-flag with SET command list $*all parameter lists. As"$*"With""In the case of"$ $ ... $n"all parameters in the form of output. [email protected] all parameter

, login to console command line mode.4: The system is not used, reserved for general use, in some special cases you can use it to do some things. For example, you can switch to this mode to do some setup when your laptop's battery is running out.5: graphical mode, after landing into the graphical GUI mode or GNOME, KDE graphical interface, such as the X Window System.6: Restart mode, the default operation level can not be set to 6, otherwise it can no

-digital things. For example, by ipaomi = Turtle You can change Dr. Mi into a turtle, and you can use the Ipaomi variable to control the turtle's drawing. The following code, drawing the image and just the same, the difference is that we assign a turtle to the variable Ipaomi1 Import Turtle 2 3 Ipaomi = Turtle 4 ipaomi.shape ("turtle") 5 x = 6ipaomi.forward (x) 7 ipaomi.left (GB) 8 Ipaomi.forward (x)

Original URL: http://www.cnblogs.com/fhefh/archive/2011/04/15/2017613.htmlThe meaning of shell variable $#,[email protected],$0,$1,$2 in Linux is explained: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

finite state automata. It is based on the Type 2 grammar: a→α|αb (right linear) or a→α| Bα (left linear).If: A-GT;A,A-GT;AB,B-GT;A,B-GT;CB, it conforms to the requirements of type 3 grammar. However, if it is deduced as: A-GT;AB,A-GT;AB,B-GT;A,B-GT;CB or deduced as: A-GT;A,A-GT;BA,B-GT;A,B-GT;CB does not conform to the requirements of type 3 method. Specifically, the example A-GT;AB,A-GT;AB,B-GT;A,B-GT;CB

; fromCollectionsImportCounter>>> Counter (a[1]) Counter ({')': 6186,'@': 6157,'(': 6154,']': 6152,'#': 6115,'_': 6112,'[': 6108,'}': 6105,'%': 6104,'!': 6080,'+': 6066,'$': 6046,'{': 6046,'': 6043,'*': 6034,'^': 6030,'\ n': 1221,'-': 4,'a': 1,'T': 1,'I': 1,'L': 1,'': 1,'y': 1,'>': 1,'u': 1,'e': 1,'Q': 1})It's kind of interesting.Because the HTML is too large, I open it directly with Urlopen () and then take the regular expression out of that part (of course, in order to show the superiority of

Anonymous functions:calc=Lambda x:x*3print(Calc (3)) # return 9Higher order functions: You can pass a function name as an argument to another function The return value can contain a function name Adorner :Essentially a function that adds additional functionality to other functions Cannot modify the source code of the decorated function Cannot modify the method of invocation of a decorated regret Simple Adorner example