99 Bottles of Beer

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Language bash

(recursive function)

Date:	12/30/07
Author:	Koen Noens
URL:	n/a
Comments:	0
Info:	http://www.gnu.org/software/bash/
Score:	(2.67 in 6 votes)

#!/bin/bash
## Koen Noens, december 2007
##  Lyrics for "99 bottles of beer"
#
#   GNU bash shell
# 	functions (can be recursive)
# 	built-in string manipulation
#	built-in arithmetic operations
#


function drinkBeer() {

	howmany=$1
	txt1=" of beer on the wall"
	txt2="take one down, pass it around"
	txt3="go to the shop and buy some more"
	
	# sing
	bottles $howmany ; echo "$txt1"
	bottles $howmany ; echo "${txt1:0:9}" 

	# continue drinking or go to the shop ? 
	if [[ howmany -gt 0 ]]; then
		howmany=$(($1 - 1))	
		nowwhat=$txt2
	else
		howmany=99
		nowwhat=$txt3
		STOP="x" 		#comment this to continue endlessly
	fi 

	# keep drinking
	echo "$nowwhat"
	bottles $howmany ; echo "$txt1" ; echo -e 
	
	[[ "$STOP" == "x" ]] || drinkBeer $howmany
	# last line has test ([[ ]]) to avoid endless loop
	# whitout it, song just restarts with 99 bottles, forever.
}

# manage syntax and spelling correction
function bottles() {
	case $1 in
		1) echo -n "one bottle" ;;
		0) echo -n "no more bottles" ;;
		*) echo -n "$1 bottles" ;;
	esac
}


# start song
drinkBeer 99

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Alternative Versions

Version	Author	Date	Comments
Bourne Again Shell	Dave Plonka	04/20/05	5
No loop, no recursion	Frédéric Lang	07/08/08	3
Self Writing	Olosta	07/18/12	0
portable, rich of features, readable	Bastian Bittorf	08/20/07	0
with arrays and functions	Vittorio Cagnetta	06/30/06	0
Arithmetic on English words for numbers	Bill Brown	07/31/08	0

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