Brilliant – where you need it – like when you accidentally try to open 8000 html files at once with your browser. sudo kill $(ps aux | grep ‘iceweasel’ | awk ‘{print $2}’) credit for Find and Kill All Processes One Liner – bash using grep and awk
http://www.linuxstall.com/block-country-iptables/ http://www.ipdeny.com/ipblocks/ http://www.ipdeny.com/ipblocks/data/countries/ #!/bin/bash # country codes ISO="cn it kr br ru tw af sa iq sy tr ua in jp id at ro pl bg vn hk ve th mx co ar ir cz ph eg pk" # set path IPT=/sbin/iptables WGET=/usr/bin/wget EGREP=/bin/egrep $IPT-save -c > /home/iptables/iptables_bak_$(/bin/date +\%Y\%m\%d\%H\%M\%S).txt SPAMLIST="countrydrop" ZONEROOT="/root/iptables" DLROOT="http://www.ipdeny.com/ipblocks/data/countries" cleanOldRules(){ $IPT -F $IPT -X $IPT -t nat...
I block all traffic to a new server while I setup users and environment using Netfilter AKA iptables. Nothing else gets in or out of the box but me. This requires 2 scripts actually. One to close the machine to all other IPs but mine, and one to “unblock”. You need to unblock while installing other software, re. LAMP, when...
In a terminal type sudo apt-get install vim sudo update-alternatives –config editor Follow the instructions to choose vim.basic – your display will vary Debian Ubuntu Change Default Editor Nano VI Gedit at System Level sudo vi /etc/vim/vimrc uncomment line 20 – syntax on logout & login
Linux Directory Rules rsync -vaz ~/qwerty ~/mydir CREATES a /qwerty directory under the ~/mydir directory COPIES the DIRECTORY and CONTENTS of the ~/qwerty directory into this newly created directory Without a trailing slash / it means “COPY THE DIRECTORY” rsync -vaz ~/qwerty/ ~/mydir Does NOT CREATE /qwerty directory COPIES the CONTENTS of the ~/qwerty directory to the mydir directory A...
sudo fdisk -l sudo fdisk /dev/sdc1 p d n p 1 w sudo mkfs -t ntfs /dev/sdc1
Script to Update and Upgrade #! /bin/bash chmod 700 /usr/bin/apt-get chmod 700 /usr/bin/aptitude chmod 700 /usr/bin/dpkg swapoff -a chown username:username /home/username/* chmod 700 /home/username/* apt-get update && apt-get upgrade –show-upgraded -y Script to End session and Harden some critical files #! /bin/bash swapon -a chmod 000 /usr/bin/apt-get chmod 000 /usr/bin/aptitude chmod 000 /usr/bin/dpkg find /home/username/ -size 0 -exec rm '{}'...
Enter at the prompt $ bash If command not found error, install BASH # pkg_add -r -v bash Now find where BASH is installed $ which bash You should see (Ubuntu) /bin/bash Change shell to BASH $ chsh -s /bin/bash username username is your User Name You should see: Password: Provide your login password You’ll need to logout (exit) and...
Users and Groups Users are located in /etc/passwd Groups are located in /etc/group The administrative ROOT account is disabled by default in Ubuntu . If you wish to enable the root account, simply give it a password by typing sudo passwd To disable the root account sudo passwd -l root The initial user created by the Ubuntu installer is a...
This one has caught me a couple times and I keep forgetting how simple it is to solve. When you create a new user and then login as the new user, you get this message: Could not chdir to home directory /home/user: Permission denied -bash: /home/user .bash_profile: Permission denied And you find that you are not (and not able to...
When you see this error message -bash: sudo: command not found su apt-get install sudo adduser username sudo apt-get install locales locale-gen en_US.UTF-8