Shell Programming and Scripting

#!/bin/sh
#URL List
url1="http://www.bbc.co.uk"
url2="http://www.cnn.com"
url3="http://www.msn.com"

#Number of users to mimic simultaneously
users=20

for (( c=1; c<=$users; c++ ))
do 
(
wait=`echo $(( RANDOM% 120 + 30 ))`
rand=`echo $(( RANDOM% 3 + 1 ))`
url=url"$rand"
wget -p $url
sleep $wait
)&
done

#!/bin/sh
url_list=( http://www.bbc.co.uk http://www.cnn.com http://www.msn.com )

#Number of users to mimic simultaneously
users=20

for (( c = 1; c <= $users; c++ )); do
  wait=`expr $RANDOM % 120 + 30`
  n=`expr $RANDOM % 3`
  url=${url_list[$n]}
  wget -p $url
  sleep $wait
done

wait=$(( RANDOM% 120 + 30 ))

#!/bin/sh
url_list=( http://www.bbc.co.uk http://www.cnn.com http://www.msn.com )

for (( ; ; )); do
  wait=`expr $RANDOM % 120 + 30`
  n=`expr $RANDOM % 3`
  url=${url_list[$n]}
  wget -p $url
  sleep $wait
done

#!/bin/bash
url_list=( http://www.bbc.co.uk http://www.cnn.com http://www.msn.com )

#Number of users to mimic simultaneously
users=20

function one_user () {
  local user=$1
  while [ 1 -eq 1 ]; do
    local wait=`expr $RANDOM % 120 + 30`
    local n=`expr $RANDOM % 3`
    local url=${url_list[$n]}
    wget -p $url
    # echo user = $user wait = $wait url = $url
    sleep $wait
  done
  }

for (( user = 1; user <= $users; user++ )); do
  one_user $user &
done