Part of the Shell exercises (continuous update)

1. Write a script/root/bin/yesorno.sh, prompt the user to enter Yes or no, and determine whether the user entered Yes or no, or other information

#!/bin/bashread-p "Put your answer (yes or no):" Answercase $Answer iny| y| [YY] [EE]                 [SS]) Determine all possibilities for user input Yes echo "you agree";; n| n| [NN]                     [OO]) Determine all possibilities for user input no echo "you disagree";; *) echo "Please input the right answer" ESAC

2. Write a script/root/bin/filetype.sh, determine the user input file path, display its file type (normal, directory, link, other file type)

#!/bin/bashread-p "Input the path:" Pathif [!  -e $Path];then//[] Medium-E To determine if there is an echo "No such file" Exitfi if [-F $Path];then echo "$Path is Common file" elif [-D $Path];then echo "$Path is Directory" elif [-L $Path];then echo "$Path is Symbol file" Else echo "Unko Wn "fi

3. Print a positive triangle with *

#!/bin/bash#version 1.0read-p "Please input the linenumber:" Linenumberfor Lineid in ' seq 1 $Linenumber ' does for A in ' seq  1 $[$Linenumber-$Lineid] '//blank first, then hit * do Echo-n "" Done for B in ' seq 1 $[2* $Lineid-1] ' Do echo-n ' * " Doneechodone

The following results are performed:

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4. Write a script, prompting the user to enter a user name, first determine whether the user exists, if not exist, then create a user, and then set the password with the user name

#!/bin/bash# #read-P "input an username:" Usernamegrep "^ $Username \>"/etc/passwd &>/dev/nullif [$? -eq 0];then Echo-e "The \033[31m$username\033[0m is exist"//ECHO-E \033[31m***\033[0m for Will * * * Coloring Else Useradd $Usernam E &>/dev/null echo-e "Add \033[32m$username\033[0m successful" echo $Username | passwd--stdin $Username & >/dev/null ID $Usernamefi

5. Write a script that prompts the user to enter the value of the positive integer n to calculate the sum of the 1+2+3...+n

#!/bin/bash# #Sum =0read-p "input the int n:" ifor N in ' seq 1 $I ';d o//n fetch value from 11 until user input value I if [$N-le $I];then Let sum+= $N Fidoneecho "The Sum is $Sum"

6. Write a script that calculates the user input for several parameters and

#!/bin/bash# #Sum =0read-p "input the int n:" Ifor N in $I;d o//n values from the user input, using a method similar to [email protected] Let sum+= $Ndone echo-n "All the parameter Sum is:" Echo-n "' Echo $I | TR "" + "'"//change user input parameter blank to + echo-e "=\033[5;31m$sum\033[0m"

7. Write a script that prompts the user to enter several positive integers, then calculates the total product, and the last example of the user input parameters, such as: 1*3*10=30

#!/bin/bash#read-p "input some postive integer:" Integersum=1for K in $Integer;d oif [$K-le 0];thenecho "is wrong ~ "Exitfidonefor I in $Integer;d o sum=$ (($Sum * $I)) Done Echo-n" all the parameter Sum is: "Echo-n" ' Echo $Integer | TR "" "*" ' "ECHO-E" =\033[5;31m$sum\033[0m "

8. Find the number within 100 that can be divisible by 3, display 8 numbers per line, and then wrap the display

#!/bin/bash# #A =0for I in {1..100};d o while [$ ($I%3)-eq 0];d o echo-ne "$I \ T" let i++ let a++ The calculation satisfies the number of integers divisible by 3 if [$ ($A%8))-EQ 0];then//is divisible by 3 for multiples of 8 and wraps echo Fi Donedoneecho

9. Use the while loop to write the script so that it accomplishes the following functions

1. Prompt the user to enter two integers: Firstnum and Secondnum (fistnum value must be less than secondnum)

2. Output all the odd numbers between Firstnum and Secondnum

3. Output all the even numbers between Firstnum and Secondnum.

#!/bin/bash# #read  -p  "input 2 numbers,the first must less equal  The second one: " First Secondwhile [  $First  -gt  $Second  ];d o   echo  "The first one must less equal the second one, please input again :) "  read -p " Input 2 numbers,the first  must less equal the second one: " first seconddonea=$[$First +1]           b=$[$Second -1]         //the scope of the two to meet the problem in between the requirements of sum=0echo -n  "The odd in the first number  and second number is:  '     for I in  ' seq  $A   $B ';d o       if [ $[$I%2] -eq 1 -o $[$I %2] -eq -1 ];then  //to determine if I is odd     echo -en  "\033[5;32m$i\033[0m "       //correct then output I value        else    let sum+ = $I          //i value is an even number is accumulated    fi     doneechoecho -e  "the sum of the even in the first  Number and second one is:\033[5;31m$sum\033[0m "

10. Use only while to write a script that prompts the user to enter a positive integer (if a positive integer is not required for the user to reenter) and then outputs any prime numbers that are less than or equal to that number

#!/bin/bash# #read  -p  "input the number: "  prime  while [[ !   "$Prime"  =~  ^[[:d igit:]]*$  | |    $Prime  -le 0 ]];d o //judgment user input as positive integer     read -p  "you  need put a positive integer:  " Prime  doneI=1echo -n " the primes in  $Prime  is:  "while [  $I  -le  $Prime  ];d o     K=1    N=0    J=2    while  [  $J  -lt $ (($I-1))  ];d o           / The/j value starts at 2, and after 1 starts the Loop        while [ $ (($I% $J)) cannot be entered  -eq 0  -a  $N  -eq 0 ];d o  //to determine whether the result of J modulo is 0          k=0         //record a return value, can not directly output I value, avoid multiple judgments multiple output                n=1         //If the condition enters the loop, set a bounce value         done    let J++    done     m=0                // Set the above n values to jump out of the loop     while [  $K  -eq 1 -a  $M  -eq 0  ];d o   //to determine if the return value is the initial value     echo -n  $I                //enters the above loop because it is not a prime number, it changes the return value to k=0     M=1    donelet i++doneecho

Note: Scripts are relatively simple when used with for and if, and interested students can write their own

11. Calculate how many days away from your birthday

#!/bin/bash# #read  -p  "Input your the month of yourbirthday,the format  SUCH AS 05&NBSP: " Birthmonth  while [[ ! " $Birthmonth " =~  [0-9][0-9] | |   $Birthmonth  -lt 1 | |   $Birthmonth  -gt 12 ]];d o//to determine whether the user input two digits, single digits need zero complement full   read -p  "input  two digits,the value must between in 01 and 12,such as 04  : " Birthmonth  doneread -p " Input your the day of your  birthday,the format such as 25 :  " birthday  until [[   $Birthday  =~ [0-9][0-9]  &&  $Birthday  -gt 0 &&   $Birthday  -le 31 ]];d o     read -p  "Input two  digits,and the value must in 01  and 31,such as 25 : " birthday  doneyear= ' date +%y '                              //defining variables, simplifying subsequent references j= ' date +%s ' if [  $Birthmonth $birthday -eq   ' date +%m%d '  ];then     //if judgment if birthdays are equal to present time    echo  -e  "\033[5;31mtoday is your birthday,happy birthday to you.\033[0m" elif  [  $Birthmonth $birthday -gt  ' date +%m%d '  ];then   //if the birthday is not yet     i= ' date -d  $Year $birthmonth$birthday +%s '    echo -e  ' \033[ 5;32m$ (((($I-$J))/60/60/24+1) \033[0m days later will be your birthday "Else                                     //else birthday is over     if [  $Birthmonth $birthday -eq 0229 ];then       // If the birthday is 2/29th #       case $ ((' date +%y '%4))  in                //Judging if this year is a leap years        0)                                //If this is a leap year          i= ' date -d $ (($Year +4)) $Birthmonth $birthday +%s ' echo -e   "\033[5;35m$ (((($I-$J))/60/60/24+1) \033[0m days later will be your  Birthday ";;       1)                 i= ' date -d $ (($Year +3)) $Birthmonth $birthday +%s ' echo -e  "\033[5;35m$ (((($I-$J)/60/60/ 24+1)) \033[0m days later will be your birthday ";;       2)         i= ' date -d $ ( $Year +2)) $Birthmonth $birthday +%s ' echo -e  "\033[5;35m$ (((($I-$J)/60/60/24+1)) \033[0m days  later will be your birthday ";;       3)          i= ' date -d  $ (($Year + 1)) $Birthmonth $birthday +%s ' echo -e  "\033[5;35m$ ((((($I-$J))/60/60/24+1) \033[0m  days later will be your birthday ";;       esac    else                                &nbsp //if birthdays are not 2/29th #             i= ' date -d  $ (($Year + 1)) $Birthmonth $birthday +%s ' echo -e  "\033[5;35m$ ((((($I-$J))/60/60/24+1) \033[0m  days later will be your birthday "    fifi

Part of the Shell exercises (continuous update)