Example 1: When the script is executed as
./createDirectories.sh day 1 90
#!/bin/bash
cd /home/kali/advshell
start=$1
stop=$2
mkdir $(eval echo day{$start..$stop})
then it creates 90 directories as day1 day2 day3 .... day90
Example 2: When the script is executed as
#!/bin/bash
cd /home/kali/advshell
dirname=$1
start=$2
stop=$3
mkdir $(eval echo $dirname{$start..$stop})
./createDirectories.sh Movie 20 50 then it creates 50 directories as Movie20 Movie21 Movie23 ...Movie50
Create a Script to backup all your work done till now.
mkdir backups
cd backups
vim backup.sh
#!/bin/bash
source = /home/kali/ingress
dest = /home/kali/backups
cur_timestamp = $(date "+%Y-m%-%d-%H-%M-$S")
echo "$cur_timestamp"
backup_file = $dest/$cur_timestamp.tgz
echo "$backup_file"
tar czf $backfile --absolute-names $source
echo "$backup_file"
Generally Cron and Crontab, to automate the backup Script
Cron is the system's main scheduler for running jobs or tasks unattended. A command called crontab allows the user to submit, edit or delete entries to cron. A crontab file is a user file that holds the scheduling information.
A user is an entity, in a Linux operating system, that can manipulate files and perform several other operations. Each user is assigned an ID that is unique for each user in the operating system.
After installation of the operating system, the ID 0 is assigned to the root user and the IDs 1 to 999 (both inclusive) are assigned to the system users and hence the ids for local user begins from 1000 onwards.
Create 2 users and just display their Usernames
sudo useradd [options] USERNAME
sudo useradd goutam
sudo useradd rohit
cat /etc/passwd