Subroutines

Now let's really get into subroutines. To do this we will use more of the tput commands:

tput cup <row><col>         # moves the cursor to row, col
tput cup 0 0                # cursor to the upper left hand side
tput cup $LINES $COLUMNS    # cursor to bottom right hand side
tput clear                  # clears the terminal screen
tput smso                   # bolds the text that follows
tput rmso                   # un-bolds the text that follows

Here is the script. This was mainly written to show the concept of a subroutine, however, it can also be used as a guide on writing interactive tools.

Chapter 4 - Script 4

#!/bin/sh
# 6/13/2017
# script4

# Subroutines
cls()
{
 tput clear
 return 0
}

home()
{
 tput cup 0 0
 return 0
}

end()
{
 let x=$COLUMNS-1
 tput cup $LINES $x
 echo -n "X"                 # no newline or else will scroll
}

bold()
{
 tput smso
}

unbold()
{
 tput rmso
}

underline()
{
 tput smul
}

normalline()
{
 tput rmul
}

# Code starts here
rc=0  ...