Linux Getting exit status of the command when using pipes I came across a situation where i needed the exit code of last command but before passing it through the pipe. For example, running the following command would give the exit code 0, even if the first command failed : root@NTRTR:/tmp# wl -i
alpine linux Alpine with XFCE and VNC on a virtual machine I was looking to create a light weight virtual machine with Graphical user interface for segmenting some of my internet browsing endeavors. I tested a couple of light weight Linux distros but ended up with just using Alpine Linux with XFCE as the Desktop
nginx Nginx - SSL Passthrough Reverse Proxy Nginx 1.9.3+ allows TCP load balancing or SSL passthrough. What this means is you can reverse proxy or load balance web applications without having to terminate SSL at the nginx. Example Configuration for name based access:stream { map $ssl_preread_server_name
Bash Touch command tips and tricks Changing modification time using touch: touch -d '-4 day' filename touch -d '-4 hour' filename touch -d "30 days ago" filename Setting Timestamp : touch -t 201606101712 filename
Linux Disabling SELINUX In order to disable selinux , run the following commands : To Disable SeLinux For Current Session only : setenforce permissive or echo 0 > /selinux/enforce To Disable Selinux permanently: vi /etc/sysconfig/selinux SELINUX=disabled
Linux Configure PPTP VPN Server Install ppp yum install ppp Download pptpd rpm wget http://poptop.sourceforge.net/yum/stable/packages/pptpd-1.3.4-2.el6.i686.rpm Set the local and remote ip in /etc/pptpd.conf vi /etc/pptpd.conf localip <local ip address of server>
Linux Extending an LVM With FreeSpace There can be a number of scenarios you want to extend an LVM. a. New Hard Drive b. Free Space c. Extended disk in a VM If you just extended space, you have that as raw filesystem. So just open fdisk and create new
Linux Installing Mono Tools in Centos Mono tools are the collection of libraries and framework , that make the possibility of using .net based applications and gui in linux. They are not available in the standard repositories, so we have to create a repo : vi /etc/yum.repos.d/mono.repo
firewall Redirect or forward ports in iptables Redirect or Forward Ports using Iptables Port Redirection: iptables -t nat -A PREROUTING -i <interface> -p tcp --dport <port number=""> -j REDIRECT --to-port <port_number></port_number></port></interface> or
Linux Set Time zone In Linux Setting Desired Time Zone In Linux View the list of available Timezones: ls /usr/share/zoneinfo cd /etc/<br></br> mv localtime localtime.old<br></br> ln -sf /usr/share/zoneinfo/GMT localtime<br>