Re: Help in Shell script

[Jan-Benedict Glaw <jbglaw@lug-owl.de>]

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On Tue, 2004-05-11 10:05:43 +0530, Jogesh Kanojia <jogesh.kanojia@patni.com>
wrote in message <000e01c43711$6c2a4de0$ae63d103@patni.com>:
> Hi
> 
> I want shell programs for the following:
> (a)  To find the smallest number among the 3 numbers given.

function get_smallest_3() {
	[ "$1" -lt "$2" -a "$1" -lt "$3" ] && echo "$1"
	[ "$2" -lt "$1" -a "$2" -lt "$3" ] && echo "$2"
	[ "$3" -lt "$1" -a "$3" -lt "$2" ] && echo "$2"
}

> (b)  To check whether the given string is a palindrome or not.

function is_palindrome() {
	if [ "$1" = "`echo "$1" | rev`" ]; then
		return 0
	else
		return 1
	fi
}

> (c)  To sort the given list of numbers in descending order.

function sort_numbers() {
	for nr in $*; do
		echo $nr
	done | sort --numeric-sort --reverse
}

> (d)  To check, how many times a given substring occurs in a given main
> string.

That seems to be a bit more complicated. Don't have an idea ad hoc...

> (e)  To find the factorial of a given number

function factorial() {
	echo -e "define fact(x) { if (x <= 1) return (1); return (fact(x-1) * x); }\nfact(4)" | bc
}


Of course, there are superb books on shell programming and yes, I don't
like preparing other people's homework:)

MfG, JBG

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