Shell Programming and Scripting

#!/bin/bash

if [ $# -ne 2 ]
then
    echo "script use: bash prova <dir> <dim>"
else
    if [ -d $1 ]
    then
        ls -1|while read file
        do
          if [ -f "$file" ] && [ $(ls -o "$file" | awk '{ print $4 }') -lt $2 ]
          then
              ls -o "$file" | awk '{ print $3,$4,$9 }' >> regFileList
          fi
        done
    else
        echo "$1 is not a directory or it does not exist"
    fi
fi

#!/bin/bash or ksh93 or ...

[ $# -ne 2 ] && echo "usage:$0 <dir> <dim>" >&2  && exit 1

dir="$1"
dim="$2"

[ ! -d "$dir" ] && echo "$dir is not a directory or it does not exist" >&2 && exit 2

cd "$dir"
ls -o | while read filedata
do
        values=($filedata)
        owner=${values[2]}
        size=${values[3]}
        date=${values[4]}
        # filename can include spaces, empty other flds, rest is filename
        for f in 0 1 2 3 4 5
        do
               values[$f]=""
        done
        name=${values[*]}

        if [ -f "$name" -a "$size" -lt "$dim" ] ; then
          echo "$name $size $date"
        fi
done

chmod a+rx prova
./prova somedir 100 > regFileList