Shell Script to read the base and height of a traingle and find its area

Posted on in Categories Shell Math last updated April 3, 2008

Calculating the area of a triangle is an elementary problem encountered often in many different situations. The best known, and simplest formula is

Computing the area of a triangle

Where S is area, b is the length of the base of the triangle, and h is the height or altitude of the triangle. The term ‘base’ denotes any side, and ‘height’ denotes the length of a perpendicular from the point opposite the side onto the side itself.

Shell Script to display current date, calendar, and the number of user logged

Posted on in Categories Academic last updated April 3, 2008

This script use the concept of command substitution. It allows allows the output of a command to replace the command name. There are two forms:

$(command)

or

command

Bash shell performs the expansion by executing command and replacing the command substitution with the standard output of the command, with any trailing newlines deleted. Embedded newlines are not deleted, but they may be removed during word splitting.

For example you can execute date command to display todays date and then set a variable called NOW:
NOW=$(date)
or
NOW=date
To display back variable value simply run echo command:
echo $NOW

Sample Shell Script

Shell Script to ask user his / her name and then display it with a G’Day/Good morning message

Posted on in Categories Academic last updated April 3, 2008

This script greets user with a message. Then it displays prompt asking user her name. Once name entered it will display Gooday message using echo command.

read statement will read one line from the user (keyboard) or from file and store it to a variable called yourname.

Script to Store given command and execute them

Posted on in Categories Academic last updated April 3, 2008

Write script to store the following command and execute them:
a) date
b) echo “Message”
c) cal

Shell script to find the number of files present in the current directory without using WC command

Posted on in Categories Academic last updated October 14, 2009

Shell Script To Display The Text Entered By The User in Bold

Posted on in Categories Academic last updated April 15, 2008

Write a shell script to display the text entered by the user in bold?

You need to use the tput utility to display text in bold. It uses the terminfo database to make the values of terminal-dependent capabilities and information available to the shell, to initialize or reset the terminal, or return the long name of the requested terminal type. tput bold turns on bold (extra bright) mode.