[[ ]] extended test in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to test if the variable 'var' is equal to 'hello'.

Bash Scripting

if [[ $var [1] "hello" ]]; then
  echo "Match"
fi

Drag options to blanks, or click blank then click option'

A==

B=

C-eq

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '=' inside [[ ]] instead of '=='.

Using '-eq' which is for numbers, not strings.

In bash [[ ]] tests, '==' is used to compare strings for equality.

2fill in blank

medium

Complete the code to check if the file 'myfile.txt' exists.

Bash Scripting

if [[ [1] "myfile.txt" ]]; then
  echo "File exists"
fi

Drag options to blanks, or click blank then click option'

A-e

B-f

C-d

D-s

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-d' which checks for directories only.

Using '-f' which checks for regular files but may fail if file is special.

The '-e' operator tests if a file or directory exists.

3fill in blank

hard

Fix the error in the code to check if variable 'num' is greater than 10.

Bash Scripting

if [[ $num [1] 10 ]]; then
  echo "Greater"
fi

Drag options to blanks, or click blank then click option'

A>

B<

C-gt

D-eq

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' which compares strings lexicographically.

Using '-eq' which checks equality, not greater than.

Inside [[ ]], numeric comparisons use '-gt' for greater than, not '>'.

4fill in blank

hard

Fill in the blank to check if variable 'word' length is greater than 3.

Bash Scripting

if [[ ${#word} [1] 3 ]]; then
  echo "Long word"
fi

Drag options to blanks, or click blank then click option'

A==

B-lt

C-eq

D-gt

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' which compares strings, not numbers.

Using '-lt' which means less than, not greater.

Use '-gt' to check if length is greater than 3.

5fill in blank

hard

Fill both blanks to check if variable 'input' is not empty and equals 'yes'.

Bash Scripting

if [[ -n $input && $input [1] [2] ]]; then
  echo "Confirmed"
fi

Drag options to blanks, or click blank then click option'

A==

B"yes"

C"no"

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' instead of '==' for equality.

Forgetting quotes around the string 'yes'.

Use '==' to compare strings and '"yes"' as the string literal.