Linux Shell Scripting Bootcamp by James Kent Lewis

Author:James Kent Lewis
Language: eng
Format: epub, pdf
Publisher: Packt Publishing

In the terminal where script7 was running you will see it has stopped with the word Killed in it.

Note, be sure to kill the right process!

In the example above, PID 29880 is my text editor session where I am writing script7. Killing that would not be a good idea :).

Now for some fun! The next script allows you to draw crude pictures on the screen:

Chapter 5 - Script 8

#!/bin/sh # # 5/16/2017 # echo "script8 - Linux Scripting Book" # Subroutines cls() { tput clear } move() # move cursor to row, col { tput cup $1 $2 } movestr() # move cursor to row, col { tput cup $1 $2 echo -n "$3" # display string } init() # set initial values { minrow=1 # terminal boundaries maxrow=24 mincol=0 maxcol=79 startrow=1 startcol=0 } restart() # clears screen, sets initial cursor position { cls movestr 0 0 "Arrow keys move cursor. 'x' to draw, 'd' to erase, '+' to restart, 'Q' to quit." row=$startrow col=$startcol draw=0 # default is not drawing drawchar="" } checktermsize2() # must be the specified size { rc1=0 # default is no error if [[ $LINES -ne $1 || $COLUMNS -ne $2 ]] ; then rc1=1 # set return code fi return $rc1 } # Code starts here if [ "$1" = "--help" ] ; then echo "Usage: script7 --help" echo " This script shows the basics on how to create a game." echo " Use the arrow keys to move the cursor." echo " Press c to restart and Q to quit." exit 255 fi checktermsize2 25 80 # terminal must be this size rc=$? if [ $rc -ne 0 ] ; then echo "Please size the terminal to 25x80 and try again." exit 1 fi init # initialize values restart # set starting cursor pos and clear screen loop=1 while [ $loop -eq 1 ] do move $row $col # position the cursor here read -n 1 -s ch case "$ch" in A) if [ $row -gt $minrow ] ; then let row-- fi ;; B) if [ $row -lt $maxrow ] ; then let row++ fi ;; C) if [ $col -lt $maxcol ] ; then let col++ fi ;; D) if [ $col -gt $mincol ] ; then let col-- fi ;; d) echo -n "" # delete char ;; x) if [ $col -lt $maxcol ] ; then echo -n "X" # put char let col++ fi ;; +) restart ;; Q) loop=0 ;; esac done movestr 24 0 "Script completed normally." echo "" # carriage return exit 0

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