appd.txt

平时学习linux总结的命令

Appendix D

---------
Chapter 5
---------
1.
#!/bin/bash
clear
echo "Enter your name"
read response 

2.
#!/bin/bash
clear
echo "Enter your name"
read response 
echo "Hello $response"
	
3.
#!/bin/bash
clear
echo "How much money would you like to make this year?"
read salary  

4.
#!/bin/bash
clear
echo "How much money would you like to earn this year?"
read salary  
let salary="$salary + 100"

5.
#!/bin/bash
clear
echo "How much money would you like to earn this year?"
read salary  
let salary="$salary + 100"
echo "I think you will earn $salary"

---------
Chapter 7
---------
1.
if [ "$SALARY" -lt 30000 ] 
   then
    echo "Higher"
fi

2.
if [ "$Fname" = "Bob" ] 
    then
    echo "Hello, Bob"
else
    echo "You're not Bob"
fi

3.
if [ "$SALARY" -lt 30000 ] 
   then
    echo "Higher"
fi

Answer:
if [ "$SALARY" -lt 30000 ] 
   then
    echo "Higher"
elif [ "$SALARY" -gt  30000 ] 
   then
     echo "Lower"
fi

4.
if [ "$SALARY" -lt 30000 ] 
  then
    echo "Higher"
elif  [ "$SALARY" -gt 30000 ] 
  then
   echo "Lower"
else
   echo "Right On"
fi

5.
if [ "$SALARY"  -gt 29999 ] && [ "$SALARY" -lt 30001 ]
    then
    echo "Right On"
fi

---------
Chapter 8
---------	
1.
case $city in
 "New York") 
         echo "New York"
         ;;
 "Chicago") 
         echo "Chicago"
         ;;
 "Boston") 
         echo "Boston"
         ;;
esac

2.
case $city in
 "New York") 
         echo "New York"
         ;;
 "Chicago") 
         echo "Chicago"
         ;;
 "Boston") 
         echo "Boston"
         ;;
      *) 
         echo "Incorrect city entered."
esac

3.
echo "a) Search by name"
echo "b) Search by telephone number"
echo "c) Search by employee number"
echo "q) Quit"
	
4.
echo "a) Search by name"
echo "b) Search by telephone number"
echo "c) Search by employee number"
echo "q) Quit"
echo " "
echo "Enter your selection: "
read selection
	
5.
echo "a) Search by name"
echo "b) Search by telephone number"
echo "c) Search by employee number"
echo "q) Quit"
echo " "
echo "Enter your selection: "
read selection 
case $selection in
 "a") 
         echo "Search by name"
         ;;
 "b") 
         echo "Search by telephone number"
         ;;
 "c") 
         echo "Search by employee number"
         ;;
 "q") 
         echo "Quit"
         ;;
      *) 
         echo "Incorrect menu selection."
esac

----------
Chapter 10
----------
1.
let sum=0
while [  "$sum" -lt 10 ]
  do
    let sum="$sum + 1"
done

2.
let sum=0
while [ "$sum" -lt 11 ]
   do
    let sum="$sum + 1"
    echo "$sum"
done

3.
let sum=0
while [ "$sum" -lt 11 ]
  do
    let sum="$sum + 1"
    if [ "$sum" -eq 10 ] 
       then
       echo "sum is equal to 10"
    fi
done

4.
declare flag="1"
while [ "$flag" -eq "1" ]
  do
   clear
   echo "a) Search by name"
   echo "b) Search by telephone number"
   echo "c) Search by employee number"
   echo "q) Quit"
   echo " "
   echo "Enter your selection: "
   read selection 
   case $selection in
 "a") 
         echo "Search by name"
         ;;
 "b") 
         echo "Search by telephone number"
         ;;
 "c") 
         echo "Search by employee number"
         ;;
 "q") 
         set flag = "0"
         ;;
      *) 
         echo "Incorrect menu selection."
   esac
done
	
5.
let flag="1"
let color=0
while [ "$flag" -eq "1" ]
   do
     if [ "$color" -eq 0 ] 
        then
           clear
           let color=1
          echo "Green"
      fi
      if [ "$color" -eq 1 ] 
         then
          clear
         let color=0
         echo "Red"
   fi
done

----------
Chapter 11
----------
1.
for city  in Paris Rome London
   do
     echo "$city"
done

2.
for friend in Bob Mary Joan
   do
     echo "Hi, $friend"
done

3.
for friend in "Bob Smith" "Mary Jones" "Joan Adams"
  do
     echo "Hi, $friend"
done

4.
for friend in "Bob Smith" "Mary Jones" "Joan Adams"
   do
     echo "Here is my friend"
     echo "Hi, $friend"
done

5.
for  friend in "Bob Smith" "Mary Jones" "Joan Adams"
   do
     echo "Here is my friend"
     echo "Hi, $friend"
     if [ "$friend" = "Mary Jones" ]
         then 
        echo "She's great!"
     fi
done

----------
Chapter 12
----------
1.
#!/bin/bash
declare flag="go"
while [ "$flag" = "go" ]
   do
        clear
       echo "Enter your name or type stop to end: "
       read friend 
       if [ "$friend" = "stop" ]
         then
           break
       fi
done

2.
#!/bin/bash
declare flag="go"
while [ "$flag" = "go" ]
   do
      clear
      echo "Enter your name or type stop to end: "
      read friend 
      if [ "$friend" = "stop"  ]
        then
           break
       fi
    if [ "$friend" = "Tom" ]
     then
      continue
    fi
done

3.
#!/bin/bash
declare flag="go"
while [ "$flag" = "go" ]
  do
     clear
     echo "Enter your name or type stop to end: "
     read friend      
     if [ "$friend" = "stop" ]
      then
        break
     fi
     if [ "$friend" = "Tom" ]
     then
       continue
     fi
     echo "Hello, $friend ."
done

4.
#!/bin/bash
declare fname="Bob"
declare lname="Smith"
if [ "$lname" = "Smith" ]
  then 
     if [ "$fname" = "Bob" ]
      then
       echo "Hello Bob Smith"
    fi
fi
	
5.
#!/bin/bash
for name in Bob Mary Joan
   do
           for degree in BS MS Ph.D.
             do
              echo "$name has these $degree degrees"
           done
done

----------
Chapter 16
----------
5.
#!/bin/bash
echo "Bob Smith 555-1212" >> mydata
echo "Mary Jones 555-5555" >> mydata
echo "Tom Adams 555-7777" >> mydata
echo "John Smith 555-4444" >> mydata
awk '$2 ~/^Jones/ {print $1, $2, $3}'mydata

----------
Chapter 18
----------
2.
#!/bin/bash
#clear the screen
clear
# prompt the user to enter a salary
echo "How much money would you like to earn this year?"
#read characters from the keyboard
read salary  
# add 100 to the value of the salary variable and assign the new value to the salary variable.
let salary="$salary + 100"
#display the message and salary on the screen
echo "I think you will earn $salary"