Configuration file reading in Bash Scripting - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read a configuration file line by line.

Bash Scripting

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

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

Afile

Bconfig

Cline

Dtext

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that is not used later in the loop.

Forgetting to use 'read -r' to prevent backslash escapes.

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

2fill in blank

medium

Complete the code to extract the value of 'username' from the config file.

Bash Scripting

username=$(grep '^username=' config.txt | cut -d'=' -f[1])

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

A2

B0

C3

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using field 1 which returns the key, not the value.

Using field 0 which is invalid.

The value is after the '=' sign, which is the second field when splitting by '='.

3fill in blank

hard

Fix the error in the code to ignore empty lines and comments starting with '#'.

Bash Scripting

while IFS= read -r line; do
  if [[ ! $line =~ ^# ]] && [[ -n $[1] ]]; then
    echo "$line"
  fi
done < config.txt

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

Afile

Bline

Cconfig

Dtext

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that was not defined.

Not checking for empty lines properly.

The condition checks if the variable 'line' is not empty and does not start with '#'.

4fill in blank

hard

Fill both blanks to create a dictionary (associative array) from config file lines with key=value format.

Bash Scripting

declare -A config
while IFS='=' read -r [1] [2]; do
  config[$key]=$value
done < config.txt

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

Akey

Bval

Cvalue

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names that don't match the assignment.

Using the same variable name for both key and value.

The first blank is the key variable, the second blank is the value variable.

5fill in blank

hard

Fill all three blanks to print all keys and values from the associative array.

Bash Scripting

for [1] in "${!config[@]}"; do
  echo "[2] = ${config[[3]]}"
done

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

Akey

Bconfig

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in the loop and inside the echo statement.

Using the array name instead of the key variable.

The loop variable is 'key', used to access keys and values in the array.