Shell Programming and Scripting

perl -ne '$foo=time + 86400;@bar=localtime($foo);printf("%d%02d%02d",$bar[5]+1900,$bar[4]+1,$bar[3])'

expr `date +%Y%m%d` + 1

$ cat dateincr
#! /bin/ksh

[[ $# != 1 ]] && echo "Enter a numeric value pls" && exit
#Taken from Vishu's script, to validate argument
[[ `echo $1 | grep [[:alpha:]]` || `echo $1 | grep [[:punct:]]` ]] && echo "$1 is not a number" && exit 1
let hours=$1*24
date1=`TZ=CST-$hours date +%Y%m%d`
echo "Here you go $date1"

$ ./dateincr 18
Here you go 20060820

#! /bin/ksh
let hours=$1*24
date1=`TZ=CST-$hours date +%Y%m%d`
echo "Here you go $date1"