Imported from ../bash-2.02.tar.gz.

examples/scripts/krand.bash

@@ -0,0 +1,74 @@
+# Originally
+#
+# From: bsh20858@news.fhda.edu (Brian S Hiles)
+# Newsgroups: comp.unix.shell
+# Subject: Re: getting random numbers
+# Date: 23 Jan 1997 23:27:30 GMT
+# Message-ID: <5c8s52$eif@tiptoe.fhda.edu>
+
+# @(#) krand  Produces a random number within integer limits
+# "krand" Korn shell script generates a random number in a
+# specified range with an optionally specified ``seed'' value.
+# Author: Peter Turnbull, May 1993
+# Modified by: Becca Thomas, January 1994
+
+# changed the optional third argument to a -s option, converted to
+# bash v2 syntax -- chet@po.cwru.edu
+
+PROGNAME=${0##*/}
+USAGE="usage: $PROGNAME [-s seed] lower-limit upper-limit"
+
+Seed=$$			# Initialize random-number seed value with PID
+
+usage()
+{
+	echo ${PROGNAME}: "$USAGE" >&2
+}
+
+errexit()
+{
+	echo ${PROGNAME}: "$@" >&2
+	exit 1
+}
+
+# Process command-line arguments:
+while getopts "s:" opt; do
+	case "$opt" in
+	s) Seed=$OPTARG ;;
+	*) usage ; exit 2;;
+	esac
+done
+
+shift $(($OPTIND - 1))
+
+case $# in
+	2) Lower=$1; Upper=$2 ;;
+	*) usage ; exit 2;;
+esac
+
+# Check that specified values are integers:
+expr "$Lower" + 0 >/dev/null 2>&1
+[ $? -eq 2 ] && { errexit "lower ($Lower) not an integer"; }
+expr "$Upper" + 0 >/dev/null 2>&1
+[ $? -eq 2 ] && { errexit "upper ($Upper) not an integer"; }
+expr "$Seed" + 0 >/dev/null 2>&1
+[ $? -eq 2 ] && { errexit "seed ($Seed) not an integer"; }
+
+# Check that values are in the correct range:
+if (( "$Lower" < 0 )) || [ ${#Lower} -gt 5 ]; then
+	errexit "lower limit ($Lower) less than zero"
+fi
+if (( "$Upper" > 32767 )) || [ ${#Upper} -gt 5 ]; then
+	errexit "upper limit ($Upper) greater than 32767"
+fi
+if (( "$Seed" < 0 )) || (( "$Seed" > 32767 )) || [ ${#Seed} -gt 5 ]; then
+	errexit "seed value ($Seed) out of range (0 to 32767)"
+fi
+(( "$Upper" <= "$Lower" )) && errexit "upper limit ($Upper) <= lower limit ($Lower)"
+
+# Seed the random-number generator:
+RANDOM=$Seed
+# Compute value, scaled within range:
+let rand="$RANDOM % ($Upper - $Lower + 1) + $Lower"
+# Report result:
+echo $rand