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Category Archives: Linux
Testing a TCP port with curl in Linux
Quick curl command to test a TCP port...
Secure wipe a disk in Linux with DD command
Here is a quick example how to secure erase a disk or a partition with the Linux DD command. In the example I am using an input file of /dev/urandom instead of /dev/random as it’s quicker to generate random data … Continue reading →...
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Create an ext4 File System in RedHat Linux
To create a an ext3 or ext4 file system in Linux there are a few steps involved. The below is a step by step guide how to create, format and mount an ext 4 disk in Linux. Create an ext4 … Continue reading →...
Using shred to secure erase files in Linux
I have used DD to overwrite a file with random data, shred is another alternative. This tool comes installed by defaut on most Linux distros. The only limitation is that it cannot secure erase the actual folders, this only works … Continue rea...
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Rescan storage command in Linux CentOS
There are many posts on how to do this, pasting my notes around it here. I just added 3 disks to my Linux CentOS vm and I needed to locate them. I knew I could do a restart and they … Continue reading →...
Common Administrative commands in RedHat 6 & 7
I’m posting a quick cheat sheet of the command line changes in RedHat or CentOS 7, full list is available here. I’m pasting my own version below as these are the commands I use most often. PS – Process List … Continue reading...
Linux – Vim file editor cheat sheet
How to navigate in a Linux file editor VI, pasting a cheat sheet. There are many more options but this is all i usually need to maneuver around. :wq Save file and quit :q! Exit without saving :set nu Display … Continue reading →...
Secure Wipe a File with DD Linux
You may have a need to secure erase a file with the Linux DD command. When you erase a file with the rm command the pointer to the file is erased but the file still exists on the file system … Continue reading →...
How to tar and untar files and folders in Linux
Here is a quick cheat sheet how to compress and extract files/folders in CentOs Linux. If you are extracting to a specific folder you have to create the folder ahead of time with mkdir /tmp/data/ or the command will not … Continue reading &r...