#!/opt/pware/bin/bash

#
# This loop prints the integer strings in the given set
#
for x in 0 1 2 3 4 5 6 7 8 9
do
	echo $x
done


#
# This loop prints integers on the same line as a form of progress meter.
# This is done using -e (enable escape sequences), -n (disable newline)
# and the \r to indicate carriage return and overwrite previous output.
#
for x in 0 1 2 3 4 5 6 7 8 9
do
	echo -e -n "$x\r"
#	sleep 1
done


#
# This loop prints strings and enforces the use of double quotes
#
for x in "the quick" "brown fox" "jumps over the" "lazy dog"
do
	echo $x
done


#
# While loop to demonstrate use of integer variable with let and (( ))
# Note the lack of the "$" dereferencing character.
#
#let x=0

while (( x < 10 ))
do
	(( x++ ))
done


#
# if test to check for existence of a file. if exists, count lines
#

if [ -a ex1.bash ]]; then
	wc -l
fi


#
# Use ps output as input to while look using read command. x vars are ignored.
# demonstrates use of many forms of quoting. Also uses escapes in echo.
#

ps awwx | while read pid x x time cmd
do
	echo -e "The Command \"$cmd\"\nhas been running for $time"
	echo "and has PID = $pid"
done


#
# Function to calculate a substring using "cut" and the arguments:
# "string-value" start-column end-column
#
# This also uses a "here-document" for use with cut.
#
function substring {

	#
	# debug statements
	#
	#echo "\$1 = \"$1\""
	#echo "\$2 = \"$2\""
	#echo "\$3 = \"$3\""

	cut -c$2-$3 <<ENDOFINPUT
$1
ENDOFINPUT

}


echo -e "\n\n\n"
substring "The quick brown fox jumps over the lazy dog." 11 25


#
# Demonstrate using variable assignment of command output.
#

varname=$(substring "The quick brown fox jumps over the lazy dog." 11 25)

echo "varname = $varname"