#!/bin/bash
clear;
# execute crontab -e and add line
# 0 6 * * * script.sh

# specifying constants
LOGS_DIR=/var/log/;
BACKUP_DIR=/var/backup;
LINES=100;
BACKUP_NAME="backup_"`date +%Y-%m-%d-%H-%M-%S.tar.gz`;

# creation of backup folder
mkdir -p /var/backup;

# user root access checking
if [ "$UID" -ne 0 ]
    then
        printf "Only users with root access can run this scripts.\n";
        exit 1;
    fi;

# logs dir existence check
cd $LOG_DIR || {
    printf "Logs directory is absent.\n" >&2;
    exit 1;
}

# archive creation (backup)
(
    cd ..;
    tar cfz BACKUP_DIR/BACKUP_NAME "LOGS_DIR";
);

# logs cleaning
rm -rf LOGS_DIR;
mkdir -p LOGS_DIR;

printf "Logs were backuped and after cleaned.\n";

exit 0