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Table Of Contents
  • Multiple BASH scripts

Multiple BASH scripts

  1. Write shell scripts specified in problem 6 at the end of Chapter 16. Test these scripts, and make sure that they work.
  2. Write shell scripts specified in problem 7 at the end of Chapter 16. Test these scripts, and make sure that they work.
  3. Write shell scripts specified in problem 13 at the end of Chapter 16. Test these scripts, and make sure that they work.

Solution

task6.sh

#/bin/bash

digits_sum=0

for number in “[email protected]”; do

square=$(($number*$number))

echo -n “$square ”

for i in $(seq 1 ${#square}); do

digits_sum=$(($digits_sum + ${square:i-1:1}))

done

done

echo

echo $digits_sum

task7.sh

#/bin/bash

gateway=$(ip route | grep default | cut -d’ ‘ -f3)

if [[ $(ip route get “$1” | grep -q $gateway) ]]; then

echo “$1 is on the local network”

else

echo “$1 is not on the local network”

fi

task13.sh

#!/bin/bash

functionget_date {

date

}

functionget_listing {

ls

}

functionget_logged_in {

who

}

function quit {

exit 0

}

while true; do

echo “Use one of the following options:”

echo ” d or D: To display today’s date and present time”

echo ” l or L: To see the listing of files in your present working directory”

echo ” w or W: To see who’s logged in”

echo ” q or Q: To quit this program”

echo “Enter your option and hit : ”

read option

case “$option” in

d|D) get_date

;;

l|L) get_listing

;;

w|W) get_logged_in

;;

q|Q) quit

;;

*) echo “Invalid option; try running the program again.”

exit 1

;;

esac

done

exit 0