Chapter 5 answers

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• Decide whether the following sentence is true or false:

1. False
2. False
3. To executes for each value in a list use while loop.
4. False
5. True
6. The PS3 reserved variable is used by select statement.
7. The default value for PS3 is set to #?.

• Write a menu driven script using the select statement to print calories for food items such as pizza, burger, Salad, Pasta etc.
• Write a shell script that, given a file name as the argument will count vowels, blank spaces, characters, number of line and symbols.
• Write a shell script that, given a file name as the argument will count English language articles such As 'A', 'An' and 'The'.
• Write a shell script that, given a file name as the argument will write the even numbered line to a file with name evenfile and odd numbered lines in a text file called oddfile.
• Write a shell script to monitor Linux server disk space using a while loop. Send an email alert when percentage of used disk space is >= 90%.
• Write a shell script to determine if an input number is a palindrome or not. A palindromic number is a number where the digits, with decimal representation usually assumed, are the same read backwards, for example, 58285.
• Write a shell program to read a number *such as 123) and find the sum of digits (1+2+3=6).
• Write a shell program to read a number and display reverse the number. For example, 123 should be printed as as 321.
• Write the shell program which produces a report from the output of ls -l in the following format using the for loop statement:

file1
file2
[DIR] test/
Total regular files : 7
Total directories : 4
Total symbolic links : 0
Total size of regular files : 2940

• Write a shell script that will count the number of files in each of your sub-directories using the for loop.
• Write a shell script that accepts two directory names as arguments and deletes those files in the first directory which are similarly named in the second directory.
• Write a shell script to search for no password entries in /etc/passwd and lock all accounts.
• Write a shell program to read two numbers and display all the odd numbers between those two numbers.

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