Shell Programming and Scripting

#!/bin/bash

echo -n "How many days back would you like to check?"; read days
echo -n "What would you like to search on?"; read search

if [ "days" = "1" ]; then
grep nmslog $search; zgrep nmslog.1.gz $search
elif [ "days" = "2" ]; then
grep nmslog $search; zgrep nmslog.1.gz $search; zgrep nmslog.2.gz
fi

echo -n " number of previous days " 
read days
let i=1
grep  "$search" nmslog 
if [[ $days -eq 0 ]] then
   exit
fi
while [[ $i -le  $days ]]
do
    zgrep "$search"  nmslog.$i.gz
    let i=$i+1
done

#!/bin/ksh

# to consider:
# validating the days variable (make sure it is a number, etc)
# validating the search variable (make sure it not null, etc)

echo "how many days      \c"
read days
echo "enter search string \c"
read search

while [ ${days} -ne 1 ]; do
        let days=days-1
        zgrep ${search} nmslog.${days}.gz
done
grep ${search} nmslog

#!/bin/bash

echo -n "How many days back would you like to check?"; read days
echo -n "What would you like to search on?"; read search

logs=
for ((d=1; d<days; d++))
do
   logs="${logs} nmslog.${d}.gz"
done

grep  ${search} nmslog
[ -n "${logs}" ] && zgrep ${search} ${logs}