Mastering Linux Shell Scripting - Second Edition

Questions

1. What is the printed value of the following code?

#!/bin/bash 
myfunc() { 
arr=$1 
echo "The array: ${arr[*]}" 
} 
 
my_arr=(1 2 3) 
myfunc ${my_arr[*]} 

2. What is the output of the following code?

#!/bin/bash 
myvar=50 
myfunc() { 
myvar=100 
} 
echo $myvar 
myfunc 

3. What is the problem with the following code? And how can you fix it?

clean_file { 
    is_file "$1" 
    BEFORE=$(wc -l "$1") 
    echo "The file $1 starts with $BEFORE" 
    sed -i.bak '/^\s*#/d;/^$/d' "$1" 
    AFTER=$(wc -l "$1") 
    echo "The file $1 is now $AFTER" 
} 

4. What is the problem with the following code? And how can you fix it?

#!/bin/bash myfunc() { arr=$@ echo "The array from inside the function: ${arr[*]}" } test_arr=(1 2 3) echo "The origianl array is: ${test_arr[*]}" myfunc (${test_arr[*]}) ...