04-07-2015
Well, sea,
I had hoped to be specific with the areas that the requester was having problems with, but I believe that there is an error in your explanation for the variables A, B, C, D, E & F.
For A, B & C what you are actually doing (I will use example A) is assigning the variable A with the value of the first passed argument or if it is not set, assigning the variable to zero. So if you called the program with my_prog Hello World then A would become Hello, B would become World and C would be set to zero.
For D & E, the default values (if the 5th & 6th passed arguments are not set) are 30 & 270 respectively.
Variable F is an invalid statement, in that there is no closing double quote.
Additionally, the clear command not only clears the screen, but puts the cursor in the top left corner.
Robin
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LEARN ABOUT DEBIAN
colors
COLORS(3) libbash colors Library Manual COLORS(3)
NAME
colors -- libbash library for setting tty colors.
SYNOPSIS
colorSet <color>
colorReset
colorPrint [<indent>] <color> <text>
colorPrintN [<indent>] <color> <text>
DESCRIPTION
General
colors is a collection of functions that make it very easy to put colored text on tty.
The function list:
colorSet Sets the color of the prints to the tty to COLOR
colorReset Resets current tty color back to normal
colorPrint Prints TEXT in the color COLOR indented by INDENT (without adding a newline)
colorPrintN The same as colorPrint, but trailing newline is added
Detailed interface description follows.
Available colors:
Green
Red
Yellow
White
The color parameter is non-case-sensitive (i.e. RED, red, ReD, and all the other forms are valid and are the same as Red).
FUNCTIONS DESCRIPTIONS
colorSet <color>
Sets the current printing color to color.
colorReset
Resets current tty color back to normal.
colorPrint [<indent>] <color>
Prints text using the color color indented by indent (without adding a newline).
Parameters:
<indent>
The column to move to before start printing. This parameter is optional. If ommitted - start output from current cursor position.
<color>
The color to use.
<color>
The text to print.
colorPrintN [<indent>] <color>
The same as colorPrint, except a trailing newline is added.
EXAMPLES
Printing a green 'Hello World' with a newline:
Using colorSet:
$ colorSet green
$ echo 'Hello World'
$ colorReset
Using colorPrint:
$ colorPrint 'Hello World'; echo
Using colorPrintN:
$ colorPrintN 'Hello World'
AUTHORS
Hai Zaar <haizaar@haizaar.com>
Gil Ran <gil@ran4.net>
SEE ALSO
ldbash(1), libbash(1)
Linux Epoch Linux