Reading files line by line (while read) in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read a file line by line using a while loop.

Bash Scripting

while [1] read line; do
  echo "$line"
done < file.txt

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

Ado

Bcat

CIFS=

Dfor

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'for' loop instead of 'while' to read lines

Not setting IFS, causing trimming of spaces

Using 'cat' incorrectly inside the while loop

Setting IFS= before read ensures that leading/trailing whitespace is preserved when reading each line.

2fill in blank

medium

Complete the code to read a file named 'data.txt' line by line and print each line.

Bash Scripting

while IFS= read [1]; do
  echo "$line"
done < data.txt

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Atext

Bline

Cfile

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using variable names that do not match the echo statement

Using reserved words as variable names

The variable 'line' is commonly used to store each line read from the file.

3fill in blank

hard

Fix the error in the code to correctly read lines from 'input.txt'.

Bash Scripting

while IFS= read line; do
  echo "$line"
done < [1]

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Ainput.txt

Bfile.txt

Coutput.txt

Ddata.txt

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong filename in the input redirection

Missing the '<' symbol before the filename

The file to read from must be 'input.txt' as intended by the code.

4fill in blank

hard

Fill both blanks to read 'myfile.txt' line by line and count lines longer than 5 characters.

Bash Scripting

count=0
while [1] read line; do
  if [ ${#line} [2] 5 ]; then
    count=$((count + 1))
  fi
done < myfile.txt
echo $count

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AIFS=

B>

C-gt

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' instead of '-gt' in test brackets

Not setting IFS= causing trimmed lines

Setting IFS= preserves spaces. The test uses '-gt' to check if length is greater than 5.

5fill in blank

hard

Fill all three blanks to create a dictionary of word lengths for words longer than 3 characters.

Bash Scripting

declare -A lengths
for word in apple banana cat dog elephant; do
  if [ ${#word} [1] 3 ]; then
    lengths[[2]]=[3]
  fi
done
for k in "${!lengths[@]}"; do
  echo "$k: ${lengths[$k]}"
done

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A-gt

Bword

C${#word}

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of '-gt' for numeric comparison

Using wrong keys or values in the associative array

Use '-gt' to check length > 3, use 'word' as key, and '${#word}' as value for length.