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Category Archives: Linux
← Older posts Newer posts →Numbering Each Line in a Text File
Sometimes we are given an error message that references a line number in a text file. We can number each line so we can find the error message right a way. In fact, we can print out the exact line … Continue reading
Posted in FreeBSD, Linux | Comments OffSecurely Wipe a File with DD
Sometimes we have sensitive data that we want to get rid of. Since deleting a file doesn’t actually prevent it from being recovered we need to do some extra steps to ensure that it can’t be recovered. In this post … Continue reading
Posted in FreeBSD, Linux, Security | 3 CommentsUse Rsync for Daily, Weekly and Full Monthly Backups
Today, we will be using rsync to make daily, weekly, incremental backups and then a full compressed/archived backup once a month. We will then use cron to automate the process. Lets face it us humans get lazy sometimes and most … Continue reading
Posted in FreeBSD, Howto, Linux | 14 CommentsMake a Backup Image of your Hard Drive with DD
Dd is a tool that is often used in computer forensics because it is extremly low level and effecient at creating exact duplicates of hard drives. For this reason it is often the tool for which all other tools are … Continue reading
Posted in FreeBSD, Howto, Linux | 1 CommentProtecting Linux from Fork Bombs
Fork bombs are basically a never ending loop. They open a processes that opens other processes that open even more processes exponentially. Causing any computer to lock up within a matter of seconds. Although they have to be ran from … Continue reading
Posted in FreeBSD, Linux | Comments OffAdd Port Knocking to SSH for Extra Security
SSH by default is very strong. It has protection against various hacks and known vulnerabilities. For instance SSH has a password retry wait time of five seconds. This makes the time for brute force attacking an SSH server very long … Continue reading
Posted in FreeBSD, Linux | 2 CommentsChanging Permissions with chmod Binary Values
Recently I accidently changed the permissions of one of my files and I didn’t know what the correct permissions were suppose to be. I did know that the other files in the same directory were the correct permission. Using the … Continue reading
Posted in FreeBSD, Linux | Comments OffLearning Cron by Example
If you are using a Linux system and want to schedule a task to run in the future you will probably need to know cron. Cron is much like Window’s Scheduled Tasks. The only difference is that cron is conifgured … Continue reading
Posted in FreeBSD, Linux | 6 Comments← Older posts Newer posts →