Part 2 - Linux Shell Scripting - Worth 5 points. - NOT using editors, create a s

Question

 Part 2 - Linux Shell Scripting - Worth 5 points.     - NOT using editors, create a sh file named: program2.sh     - Set this *.sh file to: chmod 755 *.sh     - NOT using editors, append your name, current date and time to a NEW file called results.txt     - NOT using editors, append to the *.sh file, all the commands needed so that when you execute your sh file,      this file will produce the following:           How:     - Ask the user to enter a number.    - Verify that the number is between 1 and 100.    - If the number is not between 1 and 100, then keep asking the user to enter a number until it is valid.    - Use a for loop from 1 to the value entered by the user     - Sum the results of calculating each number mod 5    - After the for loop ends, display the sum of all previous results and      append it to the results.txt file as follows       Sum of numbers is xxx 

Explanation / Answer

Following is the shell command and explanation:

Use touch for create a file using terminal: touch program2.sh

chmod is used to change the file permissions: chmod 755 program2.sh

755 = drwxr-xr-x

4 = read

2 = write

1 = execute

so , 7 = rwx, 5 = re

append your name, current date and time to a NEW file called results.txt:

create file using cat and then append the name in it,then append the date in the file:

cat>results.txt

date>>results.txt

first write the command cat>>results.txt then enter this script:

read num

if [ $num -ge 100 ]

then

read num

else

for num1 in $(seq 1 $num);

do

x=`expr $num1 % 5`

sum=`expr $sum + $x`

done

fi

echo "sum is $sum">>results.txt

You shold type this in terminal step by step:

touch program2.sh

chmod 755 program2.sh

cat>results.txt

date>>results.txt

cat>>results.txt

read num

if [ $num -ge 100 ]

then

read num

else

for num1 in $(seq 1 $num);

do

x=`expr $num1 % 5`

sum=`expr $sum + $x`

done

fi

echo "sum is $sum">>results.txt

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