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user_list--del user_list-v|--verbose-h|--help"Exit 7;;EsacFiDoneIf [$ADD-eq 1]; ThenFor the USER in ' echo $ADDUSERS |sed ' [email protected],@ @g '; DoIf ID $USER >/dev/null; Then[$DEBUG-eq 1] echo "$USER exists."ElseUseradd $USER[$DEBUG-eq 1] echo "ADD user $USER finished."FiDoneFiIf [$DEL-eq 1]; ThenFor the USER in ' echo $DELUSERS |sed ' [email protected],@ @g '; DoIf ID $USER >/dev/null; ThenUserdel-r $USER[$DEBUG-eq 1] echo "Delete $USER finished."Else[$DEBUG-eq 1] echo "$USER not exist."

$--add user_list--del user_list-v|--verbose-h|--help"Exit 7;;EsacFiDoneIf [$ADD-eq 1]; ThenFor the USER in ' echo $ADDUSERS |sed ' [email protected],@ @g '; DoIf ID $USER >/dev/null; Then[$DEBUG-eq 1] echo "$USER exists."ElseUseradd $USER[$DEBUG-eq 1] echo "ADD user $USER finished."FiDoneFiIf [$DEL-eq 1]; ThenFor the USER in ' echo $DELUSERS |sed ' [email protected],@ @g '; DoIf ID $USER >/dev/null; ThenUserdel-r $USER[$DEBUG-eq 1] echo "Delete $USER finished."Else[$DEBUG-eq 1] echo "$USER not

Aerobic exercise, also known as aerobic metabolic movement, refers to the body's physical activity in the case of adequate oxygen supply. The advantage of aerobic exercise is that it can increase the intake of oxygen, which can better consume excess heat in the body. In other words, in the course of exercise, the human body inhaled oxygen and demand equal, to ach

The best exercise time per day has been revealed by many foreign scholars: the body's ability changes around the clock. Am-Am, am-17 am is the time when the chicken speed, strength, and endurance are relatively optimal. If you perform fitness and sports training during this time, it will receive better results. When-and-14 are in the relatively lowest state, if you are engaged in sports during this time, it is prone to fatigue and the "LOAD" is too la

To make this article get treatise and ask questions, reprint please indicate the source:Http://blog.csdn.net/nomaspEmail and Skype:[email protected]Facebook:https://www.facebook.com/yuwang.keCSDN Blog: http://blog.csdn.net/nomaspSina Weibo: http://weibo.com/nomasp Exercise 3-7 Original Exercise 3.7. Consider the bank account objects created to Make-account, with the password modification described in

Exercise 4-3 OriginalExercise 4.3. Rewrite Eval So, the dispatch is the do in data-directed style. Compare this with the datadirected differentiation procedure of exercise 2.73. (You may use the car of a compound expression as the type of the expression, as was appropriate for the syntax implemented In the This section.) .AnalysisRefer to exercise 2.73. (define o

If you do not pay attention to the scientific nature of fitness, you will not be able to achieve the effect of exercise. Experts pointed out that fitness should be taken before Sunday and follow the principles of safety, proper quantity, and gradual progress. Otherwise, the fitness effect may be half the effort. In the past, many people thought that the sooner they got up, the better their health. So they often started outdoor exercises when they wer

PHP exercises (2): php exercises. PHP exercise (2), php exercise program 6. question: If a person has 100,000 yuan in cash and needs to pay a fee every time he passes through an intersection, the rule is that when his cash is greater than 50,000, he needs PHP exercises every time (2). php exercises Program 6.Question:Assume that a person has 100,000 yuan in cash and must pay 50,000 yuan each time after the

Exercise 4-7 OriginalExercise 4.7. Let* is similar to let, except that the bindings of the A let variables be performed sequentially from left to right, and E Ach binding is made in a environment in which all of the preceding bindings are visible. For example (let* ( (x 3 ) (y (+ x 2 ) ) Span class= "Hljs-list" > (z ( x y 5 ) ) ) (* x z) ) Returns 39. Explain How a let* expression can is rewritten as a set of nested let expressions,

Exercise 4-8 OriginalExercise 4.8. "Named let" are a variant of let that have the formvar>bindings>body>)The and is just as in ordinary let, except that is bound within to a procedure whose body is and whose parameters are the variables in the . Thus, one can repeatedly execute the by invoking the procedure named . For example, the iterative Fibonacci procedure (section 1.2.2) can be rewritten using named let as follows: (Define (fib N) ( LetFib-it

Exercise 15.8: Give definitions of static types and dynamic types.A: Static type: Is the type of the variable declaration, or the type generated by the expression, and the type is known at compile time .Dynamic type: Is the type of object in memory that is represented by a variable or expression and is not known until run time .Exercise 15.9: Under what circumstances can the static type of an expression be

Exercise 2.73A small problem, this is because the scheme of the number, the direct provision of variables, the former will be treated as a numeric type, the latter will be used as the symbol type. Therefore, it is not necessary to add these two predicates to the data-driven dispatch. If you add a flag to a numeric type or symbol type, it is not a waste of space or time to judge a known type in the get process.b, we have completed the problem according

Exercise 3-72 OriginalExercise 3.72. In a similar-to-exercise 3.71 generate a stream of all numbers so can be written as the sum of of the squares in three Different ways (showing how they can is so written).Code (define (square x) (* x x)) (define (sum-square x) (+ (square (car x) ) (square (cadr x) ))) (Define (squaresn s) (define (stream-cadr s) (stream-car (stream-cdr s)) ) (define

Exercise 3-82 OriginalExercise 3.82. Redo Exercise 3.5 on Monte Carlo integration in terms of streams. The stream version of Estimate-integral is not a argument telling how many trials to perform. Instead, it'll produce a stream of estimates based on successively more trials.Code (define ( Random-in-range Low High) (let ( (range ( - High low) ) ) (+ low (* (random ) range) ) ) ) (def

Python uses a for while loop to print the Yang Hui triangle exercise (list index exercise).Yang Hui Triangle is a number of triangular tables, the general form is as follows:11 11 2 11 3 3 11 4 6) 4 11 5 10 10 5 11 6 15 20 15 6 1.......................The most essential feature of the Yang Hui Triangle is that its two hypotenuse is made up of the number 1, while the remaining number equals the sum of two nu

Exercise 3-3 the last three bits of the productEnter several words, enter a number of integers (which can be positive, negative, or 0), and output the last three bits of their product. These integers are mixed with a string of uppercase letters, and your program should ignore them. Tip: Try to enter a string when executing scanf ("%d").#include Summary: 1 Note overflow2 for a break in the bad, the next code is to determine where the for-through-bad ex

Analysis of C Programming Exercise questions, c Programming Exercise questionsC program design exercise question parsing has a string containing n characters. Write a function to copy all the characters starting from the m character to another string. Code block: # Include Void cut (char * s, int x); // defines the shear function int main () {char str [20

Exercise 3-67 OriginalExercise 3.67. Modify The pairs procedure so (pairs integers integers) would produce the stream of all pairs of integers (i,j) (Witho UT the condition i Code(Define (all-pairs s T) (Cons-stream (list (stream-car s) (stream-car T)) (Interleave (interleave(stream-map (Lambda (x) ( list ( stream-car s) x ) ( stream-cdr t))( All-pairs (stream-cdr s) (stream-cdr t )))

Exercise 3-68 OriginalExercise 3.68. Louis Reasoner thinks that building a stream of the pairs from three parts is unnecessarily complicated. Instead of separating the pair (s0,t0) from the rest of the pairs on the first row, he proposes to work with the whole FIR St row, as follows: (define (pairs s t ) (interleave ( Stream-map (lambda (x ) (list (stream-car s) x) ) t ) (pairs (stream-cdr s) ( stream-cdr t ) ) ) ) Does

Exercise 3-69 OriginalCode(Define (triples s T u) (Cons-stream (list(stream-car s)(stream-car t)( Stream-car u)) (Interleave (stream-map (Lambda (x) ( cons (stream-car s) x))(stream-cdr (pairs t u) )) (triples (stream-cdr s)(stream-cdr t) (stream-cdr u)) ))); Value:triples(Define (phythagorean-numbers) (define (square x) (* x x)) (define numbers (triles integers integers integers)) (stream-filter