Shell Programming and Scripting

ls -1t | sed -n '$p' | xargs rm -i

 
if [[ anil_111 -nt anil_222 ]]; then
  rm anil_222
else
  rm anil_111
fi

#!/bin/ksh
IAm=${0##*/}
if [ $# -ne 1 ]
then    echo "Usage: $IAm NameBase" >&2
        exit 1
fi      
set -- "$1"_*
name="$1"
shift
if [ "$name" != "${name%_[*]}" ]
then    printf "%s: No files found with names starting with \"%s\"\n" \
                "$IAm" "${name%[*]}" >&2
        exit 2  
fi      
if [ $# -eq 0 ]
then    printf "%s: Only one file found: \"%s\"\n" "$IAm" "$name" >&2
        exit 3
fi      
while [ $# -ge 1 ]
do      if [ "$name" -nt "$1" ]
        then    printf "Removing \"%s\"\n" "$1"
                echo rm "$1"
        else    printf "Removing \"%s\"\n" "$name"
                echo rm "$name"
                name="$1"
        fi      
        shift 1
done    
printf "Keeping \"%s\"\n" "$name"