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#!/bin/sh
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usage() {
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help="flush-files.sh -n number_of_files_to_keep [-m email_address]\n
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usage: flush files from a folder except a number equal to argument.\n
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It only prints a warning if scripts-utils.sh is not imported in order to be used
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from the terminal."
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echo -e "${help}"
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}
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number_of_files_to_keep=''
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email_address=''
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while getopts "hn:m:" opt; do
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case "${opt}" in
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h)
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usage; exit 0;;
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n)
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number_of_files_to_keep="${OPTARG}";;
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m)
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email_address="${OPTARG}";;
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:)
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echo "Option -$OPTARG requires an argument." >&2
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usage >&2; exit 1;;
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\?)
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usage >&2; exit 1;;
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esac
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done
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shift $((OPTIND-1))
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# Check that all required parameters are there
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if [ -z "${number_of_files_to_keep}" ]; then
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echo "At least a required parameter is missing." >&2
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usage >&2
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exit 1
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fi
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# Check if scripts-utils.sh is imported.
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if [ -z "${scripts_utils}" ] ; then
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echo "Import of scripts-utils.sh required."
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. scripts-utils.sh
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fi
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check_arguments "$#" 1 "$help"
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# Must not be quoted to avoid problem with ((…))
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backups_number=$(ls | wc -l)
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number_of_backups_to_delete=$((backups_number - ${number_of_files_to_keep}))
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51
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if [ "${number_of_backups_to_delete}" -gt 0 ] ; then
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ls | head "-${number_of_backups_to_delete}" | xargs rm
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else
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if [ -n "${email_address}" ] ; then
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dir=$(pwd)
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echo "There are not enough files in $dir to Flush it. Check if backup script works fine." | mail -s "[db] $dir has a backup problem" "${email_address}"
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fi
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fi
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