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#!/bin/sh

help="# ARGS: number of files to keep, [email address]\n

# usage: flush files from a folder except a number equal to argument.\n

# It only prints a warning if scripts-utils.sh is not imported in order to be used

# from the terminal."

# Check if scripts-utils.sh is imported.

if [ -z "${scripts_utils}" ] ; then

    echo "Import of scripts-utils.sh required."

    . scripts-utils.sh

fi

check_arguments "$#" 1 "$help"

# Must not be quoted to avoid problem with ((…))

backups_number=$(ls | wc -l)

((number_of_backups_to_delete = backups_number - $1))

if [ "${number_of_backups_to_delete}" -gt 0 ] ; then

    ls | head "-${number_of_backups_to_delete}" | xargs rm

else

    if [ ! -z "$2" ] ; then

        dir=$(pwd)

        echo "There are not enough files in $dir to Flush it. Check if backup script works fine." | mail -s "[db] $dir has a backup problem" "$2"

    fi

fi