Here documents (<<EOF) in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a here document that outputs "Hello World".

Bash Scripting

cat <<[1]
Hello World
EOF

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

AEOF

BEND

CSTOP

DDONE

Attempts:

3 left

💡 Hint

Common Mistakes

Using different words after << and at the end.

Forgetting to put the ending delimiter.

The delimiter after << must match the ending delimiter exactly. "EOF" is the common choice.

2fill in blank

medium

Complete the code to assign a multi-line string to a variable using a here document.

Bash Scripting

myvar=$(cat <<[1]
Line 1
Line 2
EOF
)

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

ASTOP

BEOF

CEND

DDONE

Attempts:

3 left

💡 Hint

Common Mistakes

Using different delimiters at start and end.

Not using command substitution to assign the string.

The delimiter after << must match the ending delimiter. "EOF" is commonly used.

3fill in blank

hard

Fix the error in the here document that should print a variable's value.

Bash Scripting

name="Alice"
echo <<[1]
Hello $name
EOF

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

AEOF

B"EOF"

C-EOF

D'EOF'

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around EOF which disables variable expansion.

Not using <<- when indenting the delimiter.

Using <<-EOF allows tab-indented delimiters and preserves variable expansion.

4fill in blank

hard

Fill both blanks to create a here document that does NOT expand variables.

Bash Scripting

cat <<[1]
The value is $value
[2]

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

A'EOF'

BEOF

C"EOF"

D-EOF

Attempts:

3 left

💡 Hint

Common Mistakes

Using unquoted EOF which expands variables.

Mixing quoted and unquoted delimiters.

Quoting the delimiter (like 'EOF') disables variable expansion inside the here document.

5fill in blank

hard

Fill all three blanks to create a here document that strips leading tabs and expands variables.

Bash Scripting

cat <<[1]
	Line 1
	Value: $[2]
[3]

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

AEOF

Bname

C-EOF

D'EOF'

Attempts:

3 left

💡 Hint

Common Mistakes

Quoting EOF which disables variable expansion.

Using wrong variable name inside the here document.

Using <<-EOF with tabs before lines and matching EOF delimiter strips leading tabs and expands variables.