latest.sh

#!/bin/bash
#
## @file latest.sh
## @brief List the top N newest files in a directory or directory hierarchy
## @author Ronald Joe Record (rr at ronrecord dot com)
## @copyright Copyright (c) 2014, Ronald Joe Record, all rights reserved.
## @date Written November 1, 2013
## @version 1.0.1
##
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# The Software is provided "as is", without warranty of any kind, express or
# implied, including but not limited to the warranties of merchantability,
# fitness for a particular purpose and noninfringement. In no event shall the
# authors or copyright holders be liable for any claim, damages or other
# liability, whether in an action of contract, tort or otherwise, arising from,
# out of or in connection with the Software or the use or other dealings in
# the Software.
#

## @fn usage()
## @brief Display command line usage options
## @param none
##
## Exit the program after displaying the usage message and example invocations
usage() {
   printf "Usage: latest [-a] [-n] [-d directory] [-u] [num]\n"
   printf "\nWhere:\n"
   printf "\t-a specifies all directory entries, not just plain files\n"
   printf "\t-n specifies no recursion, current dir or specified dir only\n"
   printf "\t-d directory specifies the directory to use\n"
   printf "\tnum specifies the number of files to list\n"
   printf "\t-u prints this usage message and exits\n\n"
   exit 1
}

DIR="."
RECURSE=1
NUM=10
TYPE="-type f"

while getopts d:anu flag; do
   case $flag in
      a)
         TYPE="";
         ;;
      d)
         DIR="$OPTARG";
         ;;
      n)
         RECURSE=;
         ;;
      u)
         usage;
         ;;
   esac
done
shift $(( OPTIND - 1 ));

[ "$1" ] && {
    #if expr "$1" : '[0-9]\+$' >/dev/null
    test $1 -eq 0 2>/dev/null
    if [ $? -eq 2 ]; then
        echo "Unrecognized command line option $1"
        usage
    else
        NUM=$1
    fi
}

if [ "$RECURSE" ]
then
    find "$DIR" $TYPE -print0 | xargs -0 stat -f "%m %N" | sort -n | tail -$NUM | cut -f2- -d" "
else
    if [ "$TYPE" ]
    then
        ls -rt1 | while read foo
        do
            [ -f "$foo" ] && echo $foo
        done | tail -n$NUM
    else
        ls -rt1 | tail -n$NUM
    fi
fi