Shell Scripting

Question 1

What does a shell script contain?

Answer 1

!/bin/bash (beginning of shell script)

Comments (#)
Commands (echo,cp,grep,etc.)
Statements (if,while,for,etc.)

Question 2

How can you run a shell script?

Answer 2

chmod a+x scriptfile
./scriptfile

Question 3

What command can you utilize to create a break inside a script?

Answer 3

echo

Question 4

Create a script where
a=Jovan
b=Linux Engineer
c=Technical Center

Answer 4

!/bin/bash

a=Jovan
b=Linux Engineer
c=Technical Center

echo “My first name is $a”
echo “My job is $b”
echo “My skills were acquired at a $c”

Question 5

Create a basic script to take input from a user.

Answer 5

!/bin/bash

a=‘hostname’
echo Hello, my server name is $a
echo
echo What is your name?
read b
echo
echo Hello $b
echo
echo What school did you go to?
read c
echo
echo That’s cool! I heard $c is a good school.

Question 6

Create a script to see if this file exists under /etc/yum.repos.d/random.repo.

Answer 6

!/bin/bash

clear
if [ -e /etc/yum.repos.d/random.repo ]

   then 
   echo File does exist
   else 
   echo File does not exist fi

Question 7

What does option -eq mean?

Answer 7

Equal to for numbers

Question 8

What does option == mean?

Answer 8

Equal to for letters

Question 9

What does option -ne mean?

Answer 9

Not equal to

Question 10

What does option !== mean?

Answer 10

Not equal to for letters

Question 11

What does option -lt mean?

Answer 11

Less than

Question 12

What does option -le mean?

Answer 12

Less than or equal to

Question 13

What does option -gt mean?

Answer 13

Greater than

Question 14

What does option -ge mean?

Answer 14

Greater than or equal to

Question 15

What does file option -s mean?

Answer 15

file exists and is not empty

Question 16

What does file option -f mean?

Answer 16

File exists and is not a directory

Question 17

What does file option -d mean?

Answer 17

Directory exists

Question 18

What does file option -w mean?

Answer 18

file is writable

Question 19

What does file option -x mean?

Answer 19

File is executable

Question 20

What file option does -r mean?

Answer 20

File is readable

Question 21

Create a loop script to list weekdays.

Answer 21

!/bin/bash

i=1
for days in Mon Tues Wed Thurs Fri
do
echo “Weekday $((1++)) : $days”
done